Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham luc » than luc, tham nuoc, tham thuc
va doanh » van doanh, vay doanh, va danh
ky lang » ky dang, ky tang, tay lang
tai cuu » tai cuc, tai buu, thai cua
tai cua » thai cua, tai cuc, tri cua
te sac » te sach, te cac, te san
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) or (ky nang)) xa hoi. hieu van tham luc va doanh ((tai cuu) OR (tai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky nang)) xa hoi. hieu van tham luc va doanh ((tai cuu) OR (tai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) or (ky nang)) xa hoi. hieu van tham luc va doanh ((tai cuu) OR (tai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) or (ky nang)) xa hoi. hieu van tham luc va doanh ((tai cuu) OR (tai cua)) tre*.