Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
han tai » hang tai, nhan tai, van tai
van nha » van nhan, van ha, ban nha
nang xa » nang x, lang xa, nang ma
sai ky » sac ky
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((nang xa) or (dang xay)) hoi. hieu van nha thuoc va ((hanh vai) or (han tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang xa) OR (dang xay)) hoi. hieu van nha thuoc va ((hanh vai) OR (han tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) or (dang xay)) hoi. hieu van nha thuoc va ((hanh vai) or (han tai)) cua viet*.