Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cam lo, cham soc
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu vu » hieu va, hieu su, dieu vu
cao hoi » cau hoi, co hoi, cao hoc
lo va » lo van, lao va, ly 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 ty) OR (sach y)) nang cao hoi. ((hieu vu) or (hieu ve)) cham lo va hanh vai 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 lo va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach y)) nang cao hoi. ((hieu vu) or (hieu ve)) cham lo va hanh vai 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 lo va hanh vai cua tre*.