Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau triet » cau trieu, su triet, cua triet
va thanh » gia thanh, va tinh, le thanh
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
lai cau » lai chau, lai cam, loi cau
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang ((xa hoi) or (hoa hoc)). hieu ve cac duc ((va thanh) or (ban thanh)) lai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ((xa hoi) OR (hoa hoc)). hieu ve cac duc ((va thanh) OR (ban thanh)) lai cau triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ((xa hoi) or (hoa hoc)). hieu ve cac duc ((va thanh) or (ban thanh)) lai cau triet*.