Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
vanh dai » van dai, vanh tai, lanh dao
van vanh » van anh, van hanh, van manh
sach thu » sach thieu, sach tham, cach thuc
hieu ve » hieu va, hieu van
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
mai hoi » mai khoi, dai hoi, lai hoi
cua tu » cua tuc, cua su, cua cu
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi

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: te ((sach thu) OR (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu ve cac vuc van vanh dai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu ve cac vuc van vanh dai cua tu~".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu ve cac vuc van vanh dai cua tu*.