Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
cau thuc » cau truc, cuu thuc, can thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
nang xa » nang x, lang xa, mang xa
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 (((nang ma) OR (sang 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 (((nang ma) OR (sang 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 (((nang ma) OR (sang ma)))) hoi. hieu ve cau thuc va hanh vai va triet*".