Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
viet qua » vien quan, ket qua, viet ha
viet cua » viec cua, viet ca, biet cua
va trinh » van trinh, va tinh, lap trinh
su sach » so sach
hau loc » huu loc, phau hoc
van hau » van ha, van hai, van dau
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, vu khach
loc va » hoc va, luc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky tang xa hoi. hieu van hau loc va trinh ((viet cua) OR (viet qua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky tang xa hoi. hieu van hau loc va trinh ((viet cua) OR (viet qua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky tang xa hoi. hieu van hau loc va trinh ((viet cua) OR (viet qua)) tre*.