Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tong thong » thong thong, cong thong, thong thuong
dong thong » thong thong, nong thon, dong thanh
hien hach » thien hach, hien hanh, hien nhanh
tranh cua » doanh cua, manh cua
toan can » toan ban, toan cao, toan cau
tan can » tan van, ban can, tac can

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hach - hanh tranh cua ((tong thong) OR (dong thong)) ((tan can) or (toan can)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hach - hanh tranh cua ((tong thong) OR (dong thong)) ((tan can) OR (toan can)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hach - hanh tranh cua ((tong thong) OR (dong thong)) ((tan can) or (toan can)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien hach - hanh tranh cua ((tong thong) OR (dong thong)) ((tan can) or (toan can)) cau*.