Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau
van am » van nam, van lam, van dam

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 ly ((nang ma) or (sang ma)) hoi. hieu van am thuc va danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang ma) OR (sang ma)) hoi. hieu van am thuc va danh hai cau treo.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang ma) or (sang ma)) hoi. hieu van am thuc va danh hai cau treo*.