Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
nang va » nang van, hang va, nang ma
va nang » van nang, da nang, cam nang
lam tuc » lam thuoc, lam truoc, luat tuc
van lam » van nam
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((so sach) or (bo sach))) or (toc sach)) ky nang x hoi. hieu van lam tuc va nang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((so sach) OR (bo sach))) OR (toc sach)) ky nang x hoi. hieu van lam tuc va nang va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((so sach) or (bo sach))) or (toc sach)) ky nang x hoi. hieu van lam tuc va nang va cua tre*.