Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chong khi » khong khi, cong khi, chong lai
chong hiv » among hiv, chong li, chong vi
cac nhan » ca nhan, cac nha, cam nhan
dung khi » duong khi, dung chi, dung thi
lu hanh » luu hanh, du hanh, ly hanh
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su cac nhan ((chong khi) OR (chong hiv)) đong luc ) or ( lu hanh trinh dung khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cac nhan ((chong khi) OR (chong hiv)) đong luc ) OR ( lu hanh trinh dung khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su cac nhan ((chong khi) OR (chong hiv)) đong luc ) or ( lu hanh trinh dung khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( su cac nhan ((chong khi) OR (chong hiv)) đong luc ) or ( lu hanh trinh dung khi đong luc ))*.