Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
cac toc » cac toi, cac nuoc, cac thoi
van anh » tuan anh, van minh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac tuc » cac tu, cac tac, cac nuoc
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
van va » van vat, van van, ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xa hoi. hieu vien ((cac tuc) OR (cac toc)) ((van anh) or (van thanh)) van va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu vien ((cac tuc) OR (cac toc)) ((van anh) OR (van thanh)) van va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu vien ((cac tuc) OR (cac toc)) ((van anh) or (van thanh)) van va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu vien ((cac tuc) OR (cac toc)) ((van anh) or (van thanh)) van va triet*.