Perhaps you should try some spelling variations:
nang hang » nang sang, hang hang, cang thang
chu nang » chuc nang, chua nang, cuu nang
cau tren » dau tren, cau treo, cau tieng
ca tren » la tren, co tren, xa tren
hang vi » hanh vi, hang di, khang voi
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
cau chu » cau chiu, ca chu, cac chu
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
cu tren » tu tren, dua tren
ve cau » ke cau, va cau, ve cac
va hoi » xa hoi, va hoc, va hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang va hoi. hieu ve cau chu nang hang vi ((((ca tren) OR (cau tren))) OR (cu tren))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang va hoi. hieu ve cau chu nang hang vi ((((ca tren) or (cau tren))) or (cu tren))*.