Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
da nang » cam nang, kha nang, cao nang
xa nong » xa dong, xuat nong, may nong
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ky lang » ky dang, ky tang, tay lang
cac toc » cac toi, cac nuoc, cac thoi
ve cac » va cac, vien cac
doi va » hoi va, noi va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cac toc ((xa nong) or (da nang)) doi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cac toc ((xa nong) OR (da nang)) doi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cac toc ((xa nong) or (da nang)) doi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cac toc ((xa nong) or (da nang)) doi va triet*.