Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh tranh » canh tranh, hanh trinh, hanh trang
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
tranh va » tranh van, trang va, trinh va
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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 (ho chieu)) sang - hanh tranh va ((nang cong) or (dang cong)) dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sang - hanh tranh va ((nang cong) OR (dang cong)) dan phan dau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) sang - hanh tranh va ((nang cong) or (dang cong)) dan phan dau*.