Perhaps you should try some spelling variations:
nghiep va » nghiep vu
nghe nam » nghe lam, nghiep nam, nghe nano
nam dung » nam vung, nam dong, lam dung
sai cua » dai cua, hai cua, lai cua
am dung » am duong, lam dung, ap dung
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky tang ma hoi. lieu ((nghe nam) or (nghiep va)) thu ((nam dung) OR (am dung)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang ma hoi. lieu ((nghe nam) OR (nghiep va)) thu ((nam dung) OR (am dung)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang ma hoi. lieu ((nghe nam) or (nghiep va)) thu ((nam dung) OR (am dung)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang ma hoi. lieu ((nghe nam) or (nghiep va)) thu ((nam dung) OR (am dung)) sai cua tre*.