Perhaps you should try some spelling variations:
cham lao » chai lao, cham lai, cham vao
sach ty » sach tu, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu su, dieu vu
cao hoi » cau hoi, co hoi, cao hoc
lao va » tao va, cao va, bao 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: thuat ((sach ty) or (sach y)) nang cao hoi. ((hieu vu) or (hieu ve)) cham lao va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach y)) nang cao hoi. ((hieu vu) OR (hieu ve)) cham lao va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) or (sach y)) nang cao hoi. ((hieu vu) or (hieu ve)) cham lao va hanh vi cua tre*.