Perhaps you should try some spelling variations:
cach nhanh » cac nganh, cac nhan, cac thanh
tranh hoc » thanh hoc, tranh cuoc, tranh duoc
su canh » suc canh, su can, su anh
hoc khi » hoc khoi, hoc khia, hoc ki
tu cach » tu cac
hoa thi » hoa thai, ha thi, hoa phi
hoa hi » hoa phi, hoa hoi, hoa li

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su canh tranh hoc khi đong luc ) or ( tu cach nhanh ((hoa hi) OR (hoa thi)) đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su canh tranh hoc khi đong luc ) OR ( tu cach nhanh ((hoa hi) OR (hoa thi)) đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su canh tranh hoc khi đong luc ) or ( tu cach nhanh ((hoa hi) OR (hoa thi)) đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( su canh tranh hoc khi đong luc ) or ( tu cach nhanh ((hoa hi) OR (hoa thi)) đong luc ))*.