Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
thanh le » thinh le, thanh de, thanh liem
luoc van » luoc can, luoc va, luc van
te sach » toc sach
luu van » cuu van, luan van, luu hanh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
qua cam » qua cham, qua cac, qua ca
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu qua cam ((luoc van) or (luu van)) ((thanh le) or (thanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu qua cam ((luoc van) OR (luu van)) ((thanh le) OR (thanh ve)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. hieu qua cam ((luoc van) or (luu van)) ((thanh le) or (thanh ve)) cua tre*.