Perhaps you should try some spelling variations:
thanh kem » hanh kem, thanh ke, thanh ket
va thanh » gia thanh, ban thanh, va tinh
cuu thuc » cuu tac
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su viet » so viet
y tang » ky tang, 6 tang, 5 tang
me hoi » le hoi
ve cuu » ve cau, ve chu, ve cua
7 tang » 6 tang

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 tang) OR (7 tang)) ((me hoi) or (ma hoa)). hieu ve cuu thuc va thanh kem su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y tang) OR (7 tang)) ((me hoi) OR (ma hoa)). hieu ve cuu thuc va thanh kem su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y tang) OR (7 tang)) ((me hoi) or (ma hoa)). hieu ve cuu thuc va thanh kem su viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y tang) OR (7 tang)) ((me hoi) or (ma hoa)). hieu ve cuu thuc va thanh kem su viet*.