Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cach van » cac van, bach van, canh van
nay thuc » nam thuc, cay thuc, day thuc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach va » sach xa, sach ha, sach dao
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va nay » va ngay, va cay
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cach van) or (sach va)) nang xa hoi. hieu va nay thuc ((van hanh) OR (ban hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cach van) OR (sach va)) nang xa hoi. hieu va nay thuc ((van hanh) OR (ban hanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((cach van) or (sach va)) nang xa hoi. hieu va nay thuc ((van hanh) OR (ban hanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((cach van) or (sach va)) nang xa hoi. hieu va nay thuc ((van hanh) OR (ban hanh)) vi cua triet*.