Perhaps you should try some spelling variations:
su sach » so sach
da nang » cam nang, kha nang, cao nang
cac toc » cac toi, cac nuoc, cac thoi
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vu sach » vu bach, vu khach
ve cac » va cac, vien cac
noi va » hoi va
thiet » thieu

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