Perhaps you should try some spelling variations:
te sach » toc sach
ky sang » ky dang, ky tang, duy sang
tao hoi » tao khoi, tao boi, tay hoi
hieu va » hieu qua
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
luc va » duc va, tuc va, loc va
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 ((ky sang) OR (ky nang)) tao hoi. ((hieu va) or (lieu va)) cam luc va danh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky nang)) tao hoi. ((hieu va) OR (lieu va)) cam luc va danh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) OR (ky nang)) tao hoi. ((hieu va) or (lieu va)) cam luc va danh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky sang) OR (ky nang)) tao hoi. ((hieu va) or (lieu va)) cam luc va danh vi cua vat*.