Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cham soc, cham hoi
hieu vu » hieu va, hieu ve, hieu su
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ty nang cao hoi. hieu vu ((cham lo) OR (cam lo)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ty nang cao hoi. hieu vu ((cham lo) OR (cam lo)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ty nang cao hoi. hieu vu ((cham lo) OR (cam lo)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ty nang cao hoi. hieu vu ((cham lo) OR (cam lo)) va hanh vai cua tre*.