Perhaps you should try some spelling variations:
sach bai » sach dao, cac bai, sach xa
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
sach thi » sach thu, sach tai, sach thieu
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
cam luc » cam xuc
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 thi) or (sach bai)) nang xa hoi. hieu van ((cam luc) OR (cau luc)) ban hang vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thi) OR (sach bai)) nang xa hoi. hieu van ((cam luc) OR (cau luc)) ban hang vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thi) or (sach bai)) nang xa hoi. hieu van ((cam luc) OR (cau luc)) ban hang vi cua tu".
• Adding a wildcard symbol may retrieve word variants: te ((sach thi) or (sach bai)) nang xa hoi. hieu van ((cam luc) OR (cau luc)) ban hang vi cua tu*.