Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien anh » thien danh, tien anh, thien chanh
tranh cua » doanh cua, manh cua
dung cong » dung trong
thanh hao » thanh thao, thanh hai, thanh ho
cua dung » cua dang, cua dong, qua dung
cong ban » cong bang, cong san, cong tan
thanh ha » thanh hoa, thanh hai, nhanh 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 ((thien anh) OR (thien thanh)) - canh tranh cua dung cong ban ((thanh hao) or (thanh ha))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien thanh)) - canh tranh cua dung cong ban ((thanh hao) OR (thanh ha)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (thien thanh)) - canh tranh cua dung cong ban ((thanh hao) or (thanh ha))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (thien thanh)) - canh tranh cua dung cong ban ((thanh hao) or (thanh ha))*.