Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
xa nong » xa dong, xuat nong, may nong
da nang » cam nang, kha nang, cao nang
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 ky lang xa hoi. hieu ve cac toc ((xa nong) or (da nang)) noi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ve cac toc ((xa nong) OR (da nang)) noi va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ve cac toc ((xa nong) or (da nang)) noi va thiet*.