Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hai van » thai van, ha van, hai tan
hieu ve » hieu va, hieu van
tu cach » tu cac
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
hai va » thai va, hoi va, mai va
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((hai va) OR (hai van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((hai va) OR (hai van)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((hai va) OR (hai van)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((hai va) OR (hai van)) triet*.