Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
lang van » dang van, tang van, hoang van
lang xa » lang ha, dang xay
sanh ky » hanh ky, sang ky, nganh ky
hieu ve » hieu va, hieu van
hanh va » hanh vi
so sanh » do sanh
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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 ky ((lang xa) or (lang van)) hoi. hieu ve cac tu va ((hanh va) OR (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((lang xa) OR (lang van)) hoi. hieu ve cac tu va ((hanh va) OR (hang va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky ((lang xa) or (lang van)) hoi. hieu ve cac tu va ((hanh va) OR (hang va)) su triet".
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((lang xa) or (lang van)) hoi. hieu ve cac tu va ((hanh va) OR (hang va)) su triet*.