Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
so sach » so sanh, bo sach, co sach
tang ma » mang may, tang van
cau cua » cau qua, ca cua, cu cua
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan
dau cua » dai cua, day cua, dan cua
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y tang ma hoi. hieu ve nham ((thuc va) or (thuc day)) danh ((dau cua) OR (cau cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y tang ma hoi. hieu ve nham ((thuc va) OR (thuc day)) danh ((dau cua) OR (cau cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y tang ma hoi. hieu ve nham ((thuc va) or (thuc day)) danh ((dau cua) OR (cau cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach y tang ma hoi. hieu ve nham ((thuc va) or (thuc day)) danh ((dau cua) OR (cau cua)) te*.