Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoa » cao hoat, cao khoa, cau hoa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cuc tre » duc tre, cua tre, cuu tre

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 cao hoa. ((hieu van) OR (hieu va)) cam xuc ((va hanh) or (va danh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoa. ((hieu van) OR (hieu va)) cam xuc ((va hanh) OR (va danh)) tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoa. ((hieu van) OR (hieu va)) cam xuc ((va hanh) or (va danh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoa. ((hieu van) OR (hieu va)) cam xuc ((va hanh) or (va danh)) tai cuc tre*.