Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hanh tranh » canh tranh, hanh trinh, lanh tranh
theo tiem » theo tieu, thep tieu
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tiem) OR (them niem)) nang - ((hanh tranh) or (hanh trang)) va nang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tiem) OR (them niem)) nang - ((hanh tranh) OR (hanh trang)) va nang cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tiem) OR (them niem)) nang - ((hanh tranh) or (hanh trang)) va nang cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo tiem) OR (them niem)) nang - ((hanh tranh) or (hanh trang)) va nang cong dan toan cao*.