Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham luc » cham soc, nhan luc, cham cuu
hanh dai » hanh tai, hanh dao, vanh dai
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 ((lang xa) or (lang ha)) hoi. hieu va cham luc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((lang xa) OR (lang ha)) hoi. hieu va cham luc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cham luc va hanh dai cua tre*.