Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hoi lang » hoi dan
cam thuc » am thuc, nam thuc, cam thu
hoa lang » hoa dan, hoa van
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
su sach » vu sach
so sach » so sanh, bo sach, co sach
vi va » vi van, vai va, vu 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) OR (so sach)) ((hoi lang) or (hoa lang)) xa hoi. hieu van cam thuc va thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((hoi lang) OR (hoa lang)) xa hoi. hieu van cam thuc va thanh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ((hoi lang) or (hoa lang)) xa hoi. hieu van cam thuc va thanh vi va triet*".