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