Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
vi cua » vai cua, di cua
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
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 ((va cam) or (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ((va cam) OR (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu ((va cam) or (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ((va cam) or (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat*.