Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van khang » van khanh, van thanh, van quang
vien cau » vien cac, vien cao, vien sau
truc van » truc va, thuc van, truc ban
khang di » hang di, khang vi, khang voi
su triet » su viet, su tien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
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 (so sach)) v nang xa hoi. hieu vien cau truc van khang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) v nang xa hoi. hieu vien cau truc van khang di su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) v nang xa hoi. hieu vien cau truc van khang di su triet*.