Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien lang » thien bang, thien dang, thien nang
van trinh » van thinh, van tinh, dan trinh
cau treo » cau theo, cau tren, cau triet
dua tren » dung tren
trinh vi » trinh va, trinh ve, trinh viet
xuc van » duc van, luc van, vuc van
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
va cam » va cham, va cao, va cai

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 thien lang xa hoi. hieu ((va cam) or (va cac)) xuc van trinh vi ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien lang xa hoi. hieu ((va cam) OR (va cac)) xuc van trinh vi ((dua tren) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: su sach thien lang xa hoi. hieu ((va cam) or (va cac)) xuc van trinh vi ((dua tren) or (cau treo))*.