Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
vai cua » dai cua, hai cua, lai cua
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
dan ky » van ky
va don » va dong, va doc, la don
tu dan » tuc dan, tu ban, cu dan
va do » va dao, va doc, va co

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