In the figure below, area of triangles $AOD, DOC,$ and $AOB$ is given. Find the area of triangle $OEF$ in terms of area of these three triangles.

[asy]
import graph; size(11.52cm); real lsf=0.5; pen dps=linewidth(0.7)+fontsize(10); defaultpen(dps); pen ds=black; real xmin=-2.4,xmax=9.12,ymin=-6.6,ymax=5.16; 
pair A=(0,0), F=(9,0), B=(4,0), C=(3.5,2), D=(1.94,2.59), O=(2.75,1.57); 
draw(A--(3,4),linewidth(1.2)); draw((3,4)--F,linewidth(1.2)); draw(A--F,linewidth(1.2)); draw((3,4)--B,linewidth(1.2)); draw(A--C,linewidth(1.2)); draw(B--D,linewidth(1.2)); draw((3,4)--O,linewidth(1.2)); draw(C--F,linewidth(1.2)); draw(F--O,linewidth(1.2)); 
dot(A,ds); label("$A$",(-0.28,-0.23),NE*lsf); dot(F,ds); label("$F$",(8.79,-0.4),NE*lsf); dot((3,4),ds); label("$E$",(3.05,4.08),NE*lsf); dot(B,ds); label("$B$",(4.05,0.09),NE*lsf); dot(C,ds); label("$C$",(3.55,2.08),NE*lsf); dot(D,ds); label("$D$",(1.76,2.71),NE*lsf); dot(O,ds); label("$O$",(2.57,1.17),NE*lsf); 
clip((xmin,ymin)--(xmin,ymax)--(xmax,ymax)--(xmax,ymin)--cycle); [/asy]
1. **Identify the given areas:**
   Let the areas of triangles \( \triangle AOD \), \( \triangle DOC \), and \( \triangle AOB \) be denoted as \( S_1 \), \( S_2 \), and \( S_3 \) respectively.

2. **Understand the configuration:**
   The points \( A, B, C, D, E, F, \) and \( O \) are given in the figure. We need to find the area of \( \triangle OEF \) in terms of \( S_1, S_2, \) and \( S_3 \).

3. **Use the property of collinearity:**
   Since \( F, C, \) and \( D \) are collinear, we can use the fact that the area of a triangle formed by a point on a line segment and another point is proportional to the areas of the triangles formed by the endpoints of the segment and the same point.

4. **Express the area of \( \triangle OEF \):**
   The area of \( \triangle OEF \) can be found by considering the areas of the triangles that share the same height from point \( O \) to line \( EF \).

5. **Relate the areas:**
   Since \( \triangle AOD \) and \( \triangle DOC \) share the same height from \( O \) to line \( AD \), the area of \( \triangle AOD \) is proportional to the area of \( \triangle DOC \). Similarly, \( \triangle AOB \) shares the same height from \( O \) to line \( AB \).

6. **Combine the areas:**
   The area of \( \triangle OEF \) is the sum of the areas of \( \triangle AOD \), \( \triangle DOC \), and \( \triangle AOB \) minus the areas of the triangles that do not contribute to \( \triangle OEF \).

   \[
   \text{Area of } \triangle OEF = S_1 + S_2 + S_3
   \]

The final answer is \( \boxed{ S_1 + S_2 + S_3 } \).