Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luan hoi » luat hoi, luan hoc, luan doi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
cam tu » cam thu, nam tu, dam tu
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: ((su sach) or (thu sach)) lien quan luan hoi. hieu va ((cam tuc) OR (cam tu)) va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) lien quan luan hoi. hieu va ((cam tuc) OR (cam tu)) va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) lien quan luan hoi. hieu va ((cam tuc) OR (cam tu)) va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) lien quan luan hoi. hieu va ((cam tuc) OR (cam tu)) va hanh vi cua vat*.