Perhaps you should try some spelling variations:
lao dong » ha dong, van dong
cao nang » cao dang, cam nang, cao tang
da nang » cam nang, kha nang
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
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
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 ((lao dong) OR (((da nang) OR (cao nang)))) noi va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ve cac toc ((lao dong) OR (((da nang) OR (cao nang)))) noi va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ve cac toc ((lao dong) OR (((da nang) OR (cao nang)))) noi va thiet*.