Perhaps you should try some spelling variations:
tai quang » thai quang, mai quang, cai quang
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
danh vai » danh sai, danh va, doanh van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
van lam » van nam
lam luc » lao luc, lam duoc
va danh » va dinh, va dan, va hanh
vai cau » va cau, van cau, vai cac
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san

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 ((tai quang) or (((ky tang) OR (ky dang)))) xa hoi. hieu van lam luc va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((tai quang) OR (((ky tang) OR (ky dang)))) xa hoi. hieu van lam luc va danh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((tai quang) or (((ky tang) OR (ky dang)))) xa hoi. hieu van lam luc va danh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: te sac ((tai quang) or (((ky tang) OR (ky dang)))) xa hoi. hieu van lam luc va danh vai cau tren*.