Perhaps you should try some spelling variations:
xa dong » ha dong, van dong, lao dong
da nang » cam nang, kha nang, cao nang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
cac toc » cac toi, cac nuoc, cac thoi
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
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 ky) OR (sac ky)) lang xa hoi. hieu ve cac toc ((xa dong) or (da nang)) noi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) lang xa hoi. hieu ve cac toc ((xa dong) OR (da nang)) noi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) lang xa hoi. hieu ve cac toc ((xa dong) or (da nang)) noi va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) lang xa hoi. hieu ve cac toc ((xa dong) or (da nang)) noi va thiet*.