Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
cam tuc » cam xuc, nam thuc, dam thuc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) OR (nang x)) hoi. hieu va ((cam tuc) or (cam tu)) ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu va ((cam tuc) OR (cam tu)) ban thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (nang x)) hoi. hieu va ((cam tuc) or (cam tu)) ban thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (nang x)) hoi. hieu va ((cam tuc) or (cam tu)) ban thanh van cua tre*.