Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh may » hanh ma, hanh mau, hanh ngay
cam truc » cau truc, nam truc, lam truoc
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty hang, ly nang
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
va cam » va cham, va cac, va cao
may va » may vi, day va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((ty nang) OR (ty xang)) cao hoi. lieu va cam truc va hanh may va thieu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ((ty nang) or (ty xang)) cao hoi. lieu va cam truc va hanh may va thieu~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ((ty nang) or (ty xang)) cao hoi. lieu va cam truc va hanh may va thieu*.