Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
van nhan » van phan, van thanh, danh nhan
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, mang xa
vai cua » dai cua, hai cua, lai cua
don vai » don vi, don va, den vai
nang ma » sang ma, nang cao, mang may
thuc va » thuc vat, thuc dan, thuc day
tang ma » mang may, tang van
va don » va dong, va doc, va do
tu ban » thu ban, te ban
ban ky » van ky, dan ky

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

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