Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
nam luc » nang luc, nhan luc, nam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (sach ty)) nang xa hoi. hieu van nam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sach ty)) nang xa hoi. hieu van nam luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sach ty)) nang xa hoi. hieu van nam luc va hanh vi cua tre*.