Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
cua tre » cua te, cuu tre, cua triet
den vai » den va, den vay, den vi
don vai » don vi, don va, doi vai
thuc va » thuc vat, thuc dan, thuc day
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
dan ky » van ky
tu dan » tuc dan, tu ban, cu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((nang xa) or (tang ma)) hoi. hieu va chat thuc va ((don vai) OR (den vai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (tang ma)) hoi. hieu va chat thuc va ((don vai) OR (den vai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky ((nang xa) or (tang ma)) hoi. hieu va chat thuc va ((don vai) OR (den vai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (tang ma)) hoi. hieu va chat thuc va ((don vai) OR (den vai)) cua tre*.