Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van quang » van quan, tran quang, van tuan
su triet » su viet, su tien, ve triet
quang di » quang dai, quang d, quang de
sau truc » sach truc, tu truc, ba truc
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
bo sach » co sach, hoc sach
su sach » so sach, vu sach
di su » doi su, ki su, da su

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) or (bo sach)) va nang xa hoi. hieu vien ((sau truc) OR (cau truc)) van quang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) va nang xa hoi. hieu vien ((sau truc) OR (cau truc)) van quang di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) va nang xa hoi. hieu vien ((sau truc) OR (cau truc)) van quang di su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) va nang xa hoi. hieu vien ((sau truc) OR (cau truc)) van quang di su triet*.