Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va

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

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