Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
dung doi » huong doi, dung tai, dung co
danh doi » danh di, thanh doi, danh hoa
thuc dan » thuc hanh, hoc dan, thuc vat
hieu van » hieu va, thien van, lieu va
so sach » bo sach, co sach, hoc sach
van cam » van nam, van lam, van cau
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
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)) y nang xa hoi. hieu van cam thuc dan ((danh doi) OR (dung doi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang xa hoi. hieu van cam thuc dan ((danh doi) OR (dung doi)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) y nang xa hoi. hieu van cam thuc dan ((danh doi) OR (dung doi)) cua tu".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y nang xa hoi. hieu van cam thuc dan ((danh doi) OR (dung doi)) cua tu*.