Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
pham chuc » pham duc, pham huu, kham chua
hieu voi » hieu moi, lieu voi, hieu loi
danh vai » danh sai, danh va, doanh van
voi pham » vi pham, toi pham, loai pham
sach thu » sach thieu, sach tham, cach thuc
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
chuc va » thuc va, thuc vat
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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: so ((sach thu) OR (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu voi pham chuc va danh vai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thu) or (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu voi pham chuc va danh vai cua te~".
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) or (sach thue)) nang ((ma hoi) OR (mai hoi)). hieu voi pham chuc va danh vai cua te*.