Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hang nong » thang long, han tong
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan tap
toan ban » van ban
co sach » bo sach, cuon sach, hoc sach
doi co » doi bo, moi co, hoi co

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi co sach - hanh trinh va ((nhung cong) or (hang nong)) dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi co sach - hanh trinh va ((nhung cong) OR (hang nong)) dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi co sach - hanh trinh va ((nhung cong) or (hang nong)) dan ((toan cao) or (toan ban))*.