Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu cao » chieu cao, hieu cac, hieu ca
va triet » va thiet, va trien, ve triet
chat luc » chat xuc, chat lua, nhan luc
van hanh » van thanh, ban hanh, van ban
hang xa » hoang xa, hang va, hang ca
sach ty » sach y, sach tu, sach thu
van anh » van thanh, tuan anh, van minh
ty hang » ly hang, ty xang, thi hang
su sach » so sach, vu sach

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

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