Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
kem cua » em cua, keo cua, diem cua
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu

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 kem) or (sach ty)) nang xa hoi. ((hieu ve) or (hieu va)) cam luc van hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sach ty)) nang xa hoi. ((hieu ve) OR (hieu va)) cam luc van hanh kem cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sach ty)) nang xa hoi. ((hieu ve) or (hieu va)) cam luc van hanh kem cua tre*.