Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu van)) dat nuoc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (hieu van)) dat nuoc va hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu van)) dat nuoc va hanh vai cua tre*".