Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
tu sach » thu sach, te sach, tu cach
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vai va » dai va, hai va, lai 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 sach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((vai va) OR (mai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((vai va) OR (mai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((vai va) OR (mai va)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky lang ha noi. hieu ve am thuc van hanh ((vai va) OR (mai va)) triet*.