Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ma hoi » mai hoi, ma hoa, me hoi
vai su » va su, van su, lai su

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 _ sang ((ma hoi) or (xa hoi)). hieu ((ve cam) or (ve cac)) xuc van hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ sang ((ma hoi) OR (xa hoi)). hieu ((ve cam) OR (ve cac)) xuc van hanh vai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach _ sang ((ma hoi) or (xa hoi)). hieu ((ve cam) or (ve cac)) xuc van hanh vai su triet*.