Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thanh ve » hanh ve, thanh va, thanh vien
su triet » su viet, su tien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
duc ban » duc tan, duc van, dua ban
tu sac » tu sach, tu san, tu bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) OR (tu cac)) ky lang xa hoi. hieu van pham duc ban thanh ve ((su triet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky lang xa hoi. hieu van pham duc ban thanh ve ((su triet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu cac)) ky lang xa hoi. hieu van pham duc ban thanh ve ((su triet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu cac)) ky lang xa hoi. hieu van pham duc ban thanh ve ((su triet) or (hoa viet))*.