Perhaps you should try some spelling variations:
chat thien » phat trien, cai thien, phat hien
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh lam » thanh lap, hanh kem, hanh va
lam chat » luan chat, cao chat, ly chat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
xac va » tac va, ac va, bac va

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 nang ma hoa. ((hieu van) or (thien van)) cam ((xac va) or (duc va)) hanh lam chat thien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoa. ((hieu van) OR (thien van)) cam ((xac va) OR (duc va)) hanh lam chat thien.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoa. ((hieu van) or (thien van)) cam ((xac va) or (duc va)) hanh lam chat thien*.