Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
hang vi » hang va, hanh vi, hang di
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
vi va » vi van, vai va, vu va

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 ((y lang) OR (_ lang)) xa hoi. hieu va ((cac tuc) OR (cac tac)) van hang vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y lang) OR (_ lang)) xa hoi. hieu va ((cac tuc) or (cac tac)) van hang vi va triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((y lang) OR (_ lang)) xa hoi. hieu va ((cac tuc) or (cac tac)) van hang vi va triet*.