Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh may » hanh ma, hanh mau, hanh ngay
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
may va » may vi, day va
va cam » va cham, va cao, va cai

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)) ky nang ma hoi. lieu ((va cam) OR (va cac)) tuc va hanh may va thieu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ma hoi. lieu ((va cam) or (va cac)) tuc va hanh may va thieu~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang ma hoi. lieu ((va cam) or (va cac)) tuc va hanh may va thieu*.