Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
phan hieu » van hieu, phan kien, gian hieu
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
san can » san van, ban can, san chang
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((phan hieu) or (hoi hieu)) lang - hanh trinh vat ((nhung cong) or (dung cong)) san can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((phan hieu) OR (hoi hieu)) lang - hanh trinh vat ((nhung cong) OR (dung cong)) san can cau.
• Adding a wildcard symbol may retrieve word variants: ((phan hieu) or (hoi hieu)) lang - hanh trinh vat ((nhung cong) or (dung cong)) san can cau*.