Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
dung cong » dung trong
tien anh » tieng anh, tien manh, dien anh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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 thanh) or (tien anh)) - hanh tranh cua ((dang cong) OR (dung cong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (tien anh)) - hanh tranh cua ((dang cong) OR (dung cong)) tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) or (tien anh)) - hanh tranh cua ((dang cong) OR (dung cong)) tan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (tien anh)) - hanh tranh cua ((dang cong) OR (dung cong)) tan toan cao*.