Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hang di » hang doi, hang vi, hang dien
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
so sanh » do sanh
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
sanh y » sinh y, anh y, hanh y
ve cac » va cac, vien cac

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 y ((nang xa) OR (nang x)) hoi. hieu ve cac tuc van ((hang di) or (khang voi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang xa) OR (nang x)) hoi. hieu ve cac tuc van ((hang di) OR (khang voi)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang xa) OR (nang x)) hoi. hieu ve cac tuc van ((hang di) or (khang voi)) va triet*".