Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
van phan » van phong, luan phan, van ban
cau duc » cao duc, cau luc, chu duc
tai cua » thai cua, tai cuc, tri cua
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
cua tu » cua tuc, cua su, cua cu

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 y ((nang xa) or (lang van)) hoi. hieu van cau duc ((van phan) OR (van thanh)) tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang van)) hoi. hieu van cau duc ((van phan) OR (van thanh)) tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (lang van)) hoi. hieu van cau duc ((van phan) OR (van thanh)) tai cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang van)) hoi. hieu van cau duc ((van phan) OR (van thanh)) tai cua tu*.