Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
te sach » toc sach
cac hoc » cach hoc, cac hop, bac hoc
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan 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: ((te sach) or (thuat sach)) ky nang ((mai hoi) or (lai hoi)). hieu ve cac hoc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang ((mai hoi) OR (lai hoi)). hieu ve cac hoc va dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang ((mai hoi) or (lai hoi)). hieu ve cac hoc va dan vi cua tre*.