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
chat xuc » chat huu, cam xuc, chao xu
cam dan » cac dan, ca dan, nam dan
cac xuc » cam xuc, cac nuoc, cac cuoc
nang xa » nang x, lang xa, nang ma
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: so ((sach thu) OR (sach tham)) nang xa hoi. hieu vien ((cac xuc) or (chat xuc)) cam dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach tham)) nang xa hoi. hieu vien ((cac xuc) OR (chat xuc)) cam dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thu) OR (sach tham)) nang xa hoi. hieu vien ((cac xuc) or (chat xuc)) cam dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) OR (sach tham)) nang xa hoi. hieu vien ((cac xuc) or (chat xuc)) cam dan vi cua tre*.