Perhaps you should try some spelling variations:
thiet anh » thuyet anh, thien danh, thich anh
thien anh » thien danh, tien anh, thien thanh
tranh cua » doanh cua, manh cua
thanh cao » thanh cac, thanh thao, thanh cham
ban cong » bang cong, van cong, phan cong
cong ban » cong bang, cong san, cong tan
thanh ca » thanh cha, thanh cac, thanh ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet anh) OR (thien anh)) - canh tranh cua ban cong ban ((thanh cao) or (thanh ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet anh) OR (thien anh)) - canh tranh cua ban cong ban ((thanh cao) OR (thanh ca)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet anh) OR (thien anh)) - canh tranh cua ban cong ban ((thanh cao) or (thanh ca))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet anh) OR (thien anh)) - canh tranh cua ban cong ban ((thanh cao) or (thanh ca))*.