Perhaps you should try some spelling variations:
sach tham » sach nha
hieu vien » hieu hien, hieu viec, thieu nien
sach thu » sach thue, sach thieu, cach thuc
cam dan » cac dan, ca dan, nam dan
cac xuc » cac nuoc, chat xuc, cac cuoc
bang xa » lang xa, bang va, mang xa
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 thu) or (sach tham)) bang xa hoi. hieu vien ((cac xuc) or (cam xuc)) cam dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach tham)) bang xa hoi. hieu vien ((cac xuc) OR (cam xuc)) cam dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sach tham)) bang xa hoi. hieu vien ((cac xuc) or (cam xuc)) cam dan vi cua tre*.