Perhaps you should try some spelling variations:
sanh thanh » danh thanh, anh thanh, san thanh
can thanh » ban thanh, van thanh, cac thanh
cong khi » cong thai, khong khi, co khi
so sanh » do sanh
hoa khi » hoa phi, hoa hi, hoc khi
hoa thi » hoa thai, ha thi, hoa phi
su can » su van, su cao, tu can

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

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