Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
va tinh » may tinh
vu sach » vu bach, su sach, vu khach
doi su » oi su, don su, voi su

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

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