Perhaps you should try some spelling variations:
khanh thich » hanh thich, khanh trach, khanh thanh
thich su » tich su, thich ngu, thich sai
hoc giao » hoc cao
thi hanh » thi thanh
tinh son » tinh toan, dinh so, tinh hoc
don gian » dan gian
tinh so » tinh soc, dinh so, tich so

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( duy khanh thich su - hoc giao ) or ( thi hanh ((tinh so) OR (tinh son)) - don gian ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( duy khanh thich su - hoc giao ) OR ( thi hanh ((tinh so) OR (tinh son)) - don gian ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( duy khanh thich su - hoc giao ) or ( thi hanh ((tinh so) OR (tinh son)) - don gian ))*".