Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van thanh » ban thanh, van tuan
vien cac » vien bach, vien dai, vien da
va triet » va thiet, va trien, ve triet
canh tac » canh tay, canh giac, cong tac
canh xa » canh va, canh tay, manh xay
sac ky » cac ky, sai ky
cac tu » cac thu, cach tu, cac du
vai va » mai va, dai va, hai va
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 ((canh xa) or (canh tac)) hoi. hieu vien cac tu ((van ban) or (van thanh)) vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((canh xa) OR (canh tac)) hoi. hieu vien cac tu ((van ban) OR (van thanh)) vai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((canh xa) or (canh tac)) hoi. hieu vien cac tu ((van ban) or (van thanh)) vai va triet*.