Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang tai » hang tai, tang tai, sang tai
hanh dai » hanh tai, hanh dao, vanh dai
nang mai » nang ma, lang mai, nang cai
hieu ve » hieu va, hieu van
thuc va » thuc dan, thuc day
so sach » so sanh, bo sach, co sach
sach v » sach va, sach y, sach 2
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: so sach v ((nang mai) or (nang tai)) hoi. hieu ve am ((thuc va) OR (thuc vat)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v ((nang mai) OR (nang tai)) hoi. hieu ve am ((thuc va) OR (thuc vat)) hanh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v ((nang mai) or (nang tai)) hoi. hieu ve am ((thuc va) OR (thuc vat)) hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach v ((nang mai) or (nang tai)) hoi. hieu ve am ((thuc va) OR (thuc vat)) hanh dai cua viet*.