Perhaps you should try some spelling variations:
khien tinh » khien thich, bien tinh, dien tinh
thien tinh » thien minh, tien tinh, trien tinh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong anh » cong danh, dong anh, hong anh

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

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