Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thi hang » thi nang, thi hong, thi thanh
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
vai cua » dai cua, hai cua, lai cua
va hanh » va thanh, va danh, ban hanh
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 ((thi hang) or (thi hanh)) xa hoi. hieu va cam tuc ((va hanh) OR (van hanh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (thi hanh)) xa hoi. hieu va cam tuc ((va hanh) OR (van hanh)) vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thi hang) or (thi hanh)) xa hoi. hieu va cam tuc ((va hanh) OR (van hanh)) vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) or (thi hanh)) xa hoi. hieu va cam tuc ((va hanh) OR (van hanh)) vai cua triet*.