Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang xa » nang x, lang xa, nang ma
danh di » xanh di, danh dien, danh gia
danh du » danh dau, danh tu, dinh du
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (cac ky)) nang xa hoi. hieu van chat thuc vat ((danh di) OR (danh du)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (cac ky)) nang xa hoi. hieu van chat thuc vat ((danh di) OR (danh du)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach y) or (cac ky)) nang xa hoi. hieu van chat thuc vat ((danh di) OR (danh du)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (cac ky)) nang xa hoi. hieu van chat thuc vat ((danh di) OR (danh du)) cua tre*.