Perhaps you should try some spelling variations:
nghe nam » nghe lam, nghiep nam, nghe nano
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
nang xa » lang xa, nang ma, mang xa
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
he nam » ha nam
vi cua » vai cua, di cua
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: vu sac ky ((nang xa) or (nang x)) hoi. hieu ((he nam) OR (nghe nam)) thuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang xa) OR (nang x)) hoi. hieu ((he nam) OR (nghe nam)) thuc van hanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((nang xa) or (nang x)) hoi. hieu ((he nam) OR (nghe nam)) thuc van hanh vi cua te*".