Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hieu cao » chieu cao, hieu cac, hieu ca
chat xuc » chat huu, cam xuc, chao xu
dieu tra » dieu tri, kiem tra, dieu cua
te sach » toc sach
hang xa » hoang xa, hang va, hang ca
van anh » tuan anh, van minh
tra tre » tran tren, tran tri, tran tro

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu hang xa hoi. hieu cao chat xuc ((van anh) or (van thanh)) dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu hang xa hoi. hieu cao chat xuc ((van anh) OR (van thanh)) dieu tra tre.
• Adding a wildcard symbol may retrieve word variants: te sach thu hang xa hoi. hieu cao chat xuc ((van anh) or (van thanh)) dieu tra tre*.