Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cau thuc » cau truc, cuu thuc, can thuc
hanh vai » hanh vi, hanh va, hanh tai
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, ang xa
su sach » so sach, vu sach
ve cau » ke cau, va cau, ve cac
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((((nang xa) OR (mang xa))) or (nang ma)) hoi. hieu ve cau thuc va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((((nang xa) OR (mang xa))) OR (nang ma)) hoi. hieu ve cau thuc va hanh vai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((((nang xa) OR (mang xa))) or (nang ma)) hoi. hieu ve cau thuc va hanh vai va triet*".