Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
duc manh » suc manh, duc anh, duc minh
lai cua » dai cua, hai cua, lai chau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. ((hieu ve) or (hieu va)) cam ((duc manh) or (duc tan)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc manh) OR (duc tan)) hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu ve) or (hieu va)) cam ((duc manh) or (duc tan)) hanh lai cua viet*.