Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
theo chieu » theo tieu, ho chieu, thi chieu
phuong dan » phuong danh, phuong doan, huong dan
theo chu » cho chu, chao chu, theo yeu
qua dung » quang dung, qua song, qua cong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo chu)) tinh - hanh tranh ((qua dung) OR (su dung)) phuong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) tinh - hanh tranh ((qua dung) OR (su dung)) phuong dan than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) tinh - hanh tranh ((qua dung) OR (su dung)) phuong dan than tap".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) tinh - hanh tranh ((qua dung) OR (su dung)) phuong dan than tap*.