Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
va tinh » may tinh
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
lang xa » lang ha, lang van
sac ky » cac ky, sai ky
doi su » oi su, don su, voi su
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((lang xa) or (dang xay)) hoi. hieu va cac tuc ((gia thanh) or (va tinh)) doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((lang xa) OR (dang xay)) hoi. hieu va cac tuc ((gia thanh) OR (va tinh)) doi su triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((lang xa) or (dang xay)) hoi. hieu va cac tuc ((gia thanh) or (va tinh)) doi su triet*.