Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
cham hoi » cham voi, cham h'roi, pham hoai
nang dau » hang dau, xang dau, nang du
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
dau hoi » cau hoi, dai hoi, dan hoi
cua tre » cua te, cuu tre, cua triet
cham o » cham soc
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: ((thuat sach) or (thuat lanh)) ky nang dau hoi. hieu ve ((cham hoi) or (cham o)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) ky nang dau hoi. hieu ve ((cham hoi) OR (cham o)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat lanh)) ky nang dau hoi. hieu ve ((cham hoi) or (cham o)) va hanh vi cua tre*.