Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
va tinh » may tinh
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ve » hieu va
tinh va » tich va, trinh van, trinh vat
coc tuc » coc luc, hoc thuc, doc thuc
va cua » va chua, via cua, ca cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) OR (hieu van)) coc tuc va tinh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) or (hieu van)) coc tuc va tinh va cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) or (hieu van)) coc tuc va tinh va cua te*.