Perhaps you should try some spelling variations:
thinh le » trinh ly
luoc van » luoc can, luoc va, luc van
te sach » toc sach
sach vu » sach va, sach tu, sach uu
luu van » cuu van, luan van, luu hanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
vu nang » vuc nang, va nang, vu dang
ma hoi » mai hoi, ma hoa, me hoi
le cua » ly cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach vu nang ((ma hoi) OR (xa hoi)). hieu ve cam ((luoc van) or (luu van)) thinh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang ((ma hoi) OR (xa hoi)). hieu ve cam ((luoc van) OR (luu van)) thinh le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang ((ma hoi) OR (xa hoi)). hieu ve cam ((luoc van) or (luu van)) thinh le cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang ((ma hoi) OR (xa hoi)). hieu ve cam ((luoc van) or (luu van)) thinh le cua tre*.