Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, dang cong, bang cong
dung cong » dung trong
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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 sang - ((hanh tranh) OR (hanh trinh)) va ((nang cong) or (dung cong)) dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - ((hanh tranh) OR (hanh trinh)) va ((nang cong) OR (dung cong)) dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sang - ((hanh tranh) OR (hanh trinh)) va ((nang cong) or (dung cong)) dan phan cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - ((hanh tranh) OR (hanh trinh)) va ((nang cong) or (dung cong)) dan phan cau*.