Perhaps you should try some spelling variations:
tham nang » nham nang, tham lang, tham nhung
pham chuc » pham duc, pham huu, kham chua
chuc van » chu van, chuc va, thuc van
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hai cua » thai cua, dai cua, hoi cua
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) or (co sach)) tham nang cao hoi. hieu ve pham chuc van hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) tham nang cao hoi. hieu ve pham chuc van hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) tham nang cao hoi. hieu ve pham chuc van hanh hai cua tu*.