Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
ve cham » va cham, ve chat, vu cham
tu cham » toc cham, thi cham
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi. hieu ((ve cham) or (tu cham)) xuc ((va hanh) or (van hanh)) vi van thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ((ve cham) OR (tu cham)) xuc ((va hanh) OR (van hanh)) vi van thiet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ((ve cham) or (tu cham)) xuc ((va hanh) or (van hanh)) vi van thiet*.