Perhaps you should try some spelling variations:
thanh tung » thanh cong
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
thanh phan » thanh pho, thanh san, thanh hai
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - ((thanh tung) or (hanh trinh)) cua nhung cong ((thanh phan) OR (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((thanh tung) OR (hanh trinh)) cua nhung cong ((thanh phan) OR (thanh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - ((thanh tung) or (hanh trinh)) cua nhung cong ((thanh phan) OR (thanh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((thanh tung) or (hanh trinh)) cua nhung cong ((thanh phan) OR (thanh toan)) cau*.