Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
luc ngan » luc nganh, luc nhan, luat ngan
sach ty » sach y, sach tu, sach thu
hang vi » hang va, hanh vi, hang di
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
sach uu » sach luu, sach tu, sach xu
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
vi dau » vi dai, va dau, bi dau

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 ty) or (sach uu)) nang ((ma hoi) or (xa hoi)). hieu ve cam luc ngan hang vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach uu)) nang ((ma hoi) OR (xa hoi)). hieu ve cam luc ngan hang vi dau tren.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach uu)) nang ((ma hoi) or (xa hoi)). hieu ve cam luc ngan hang vi dau tren*.