Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ty hang » ly hang, thi hang, thu hang
cam tuc » cam xuc, cam tu, dam thuc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va ((cam tuc) or (nam thuc)) van hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va ((cam tuc) OR (nam thuc)) van hanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va ((cam tuc) or (nam thuc)) van hanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) OR (ty xang)) xa hoi. hieu va ((cam tuc) or (nam thuc)) van hanh hai cua triet*.