Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
truc van » truc va, thuc van, truc dan
truc ban » thuc ban, truc dan, truoc bang
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
hay cu » hat cu, hay su
ha cu » hat cu, nha cu, ha vu

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: thu sach y nang xa hoi. thien van cam ((truc ban) OR (truc van)) thanh ((ha cu) OR (hay cu)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. thien van cam ((truc ban) or (truc van)) thanh ((ha cu) OR (hay cu)) tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. thien van cam ((truc ban) or (truc van)) thanh ((ha cu) OR (hay cu)) tren*.