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
dinh dai » dinh dat, sinh dai, dinh dao
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
cua te » cua tu

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 (sac ky)) nang xa hoi. hieu van chat thuc va dinh dai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) nang xa hoi. hieu van chat thuc va dinh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach y) or (sac ky)) nang xa hoi. hieu van chat thuc va dinh dai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sac ky)) nang xa hoi. hieu van chat thuc va dinh dai ((cua tre) OR (cua te))*.