Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
sach thu » sach thue, sach thieu, sach tham
luc ngan » luc nganh, luc nhan, luat ngan
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
cu tren » tu tren, dua tren
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thu)) xang xa hoi. hieu va cau luc ngan hang vi ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) xang xa hoi. hieu va cau luc ngan hang vi ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) xang xa hoi. hieu va cau luc ngan hang vi ((cau tren) or (cu tren))*.