Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
van cac » van hac, van cau, van bac
vi su » va su, ve su, ki 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 ((ty lang) or (ty hang)) xa hoi. hieu van cac xuc ((van hanh) or (ban thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (ty hang)) xa hoi. hieu van cac xuc ((van hanh) OR (ban thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty lang) or (ty hang)) xa hoi. hieu van cac xuc ((van hanh) or (ban thanh)) vi su triet*.