Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
dan danh » van danh, han danh, ban danh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
doi cua » dai cua, hoi cua
van cam » van nam, van lam, van cau
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
nang xa » lang xa, nang ma, mang xa
cua cu » cua chu, cua cau, cua su

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) or (bo sach)) y ((nang xa) or (nang x)) hoi. hieu van cam thuc dan danh doi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y ((nang xa) OR (nang x)) hoi. hieu van cam thuc dan danh doi cua cu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) y ((nang xa) or (nang x)) hoi. hieu van cam thuc dan danh doi cua cu*.