Perhaps you should try some spelling variations:
nhan dang » nhan dan, phan dang, tran dang
thuc nhan » thuoc nhan, thu nhan, thuc chan
cam thuc » am thuc, nam thuc, cam thu
dang doi » dung doi, dang do, dang noi
hieu van » hieu va, thien van, lieu va
so sach » bo sach, co sach, hoc sach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cua chu » sua chua
cua tu » cua tuc, cua su, cua cu

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 (so sanh)) ky nang xa hoi. hieu van cam thuc nhan dang doi ((cua tu) or (cua chu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky nang xa hoi. hieu van cam thuc nhan dang doi ((cua tu) OR (cua chu)).
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ky nang xa hoi. hieu van cam thuc nhan dang doi ((cua tu) or (cua chu))*.