Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
hien tinh » khien tinh, thien tinh, bien tinh
tranh cua » doanh cua, manh cua
dung cong » dung trong
toan cao » toan tap
toan ban » van ban

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 tinh - hanh tranh cua ((thong cong) or (dung cong)) hach ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - hanh tranh cua ((thong cong) OR (dung cong)) hach ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - hanh tranh cua ((thong cong) or (dung cong)) hach ((toan cao) or (toan ban))*.