Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
pham chuc » pham duc, pham huu, kham chua
sach thu » sach thieu, sach tham, cach thuc
hanh tai » thanh tai, hang tai, han tai
nang ma » tang ma, sang ma, nang cao
hieu vi » hieu voi, hieu va, hieu ve
chuc va » thuc va, thuc vat
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach thu) or (sach thue)) nang ma hoi. hieu vi pham chuc va hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach thue)) nang ma hoi. hieu vi pham chuc va hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: so ((sach thu) or (sach thue)) nang ma hoi. hieu vi pham chuc va hanh tai cua tu*.