Perhaps you should try some spelling variations:
doan manh » doan minh, hoang manh, tran manh
dan manh » dang manh, van manh, day manh
hoc viet » hoc hien
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu le » hieu ve, hieu he, hieu ly
vai hoc » van hoc, dai hoc, bai hoc
x hoi » xa hoi, o hoi, x ho
le am » le ham, le nam, le a

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu le am thuc ((dan manh) or (doan manh)) vai hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu le am thuc ((dan manh) OR (doan manh)) vai hoc viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu le am thuc ((dan manh) or (doan manh)) vai hoc viet*.