Perhaps you should try some spelling variations:
su triet » su tien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac toi » cac thoi
toi dao » thoi dao, toc dao, toi da
dao dan » dao van, cao dang, dao dong
dan vai » dan va, dan tai, dan vat
su viet » so viet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai 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 sac ky lang xa hoi. lieu va cac toi dao dan vai ((va thiet) or (((su triet) or (su viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. lieu va cac toi dao dan vai ((va thiet) OR (((su triet) OR (su viet)))).
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. lieu va cac toi dao dan vai ((va thiet) or (((su triet) or (su viet))))*.