Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va danh, ban hanh
va cao » va co, va dao, va bao
vi cua » vai cua, di cua

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 ty nang cao hoi. hieu ((va cac) 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 ty nang cao hoi. hieu ((va cac) 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 ty nang cao hoi. hieu ((va cac) or (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoi. hieu ((va cac) or (va cao)) xuc ((va hanh) OR (va thanh)) vi cua vat*.