Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va thanh, va thuat
va cham » va chat
y tang » ky tang, 6 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
7 tang » 6 tang
cua te » cua tu

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) or (7 tang)) ma hoi. hieu ((va cham) OR (va tham)) thuc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y tang) OR (7 tang)) ma hoi. hieu ((va cham) OR (va tham)) thuc va hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y tang) or (7 tang)) ma hoi. hieu ((va cham) OR (va tham)) thuc va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((y tang) or (7 tang)) ma hoi. hieu ((va cham) OR (va tham)) thuc va hanh dai cua te*.