Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hang » van hang, va nang, va lang
soc va » hoc va, loc va, doc va
tai va » thai va, mai va, dai 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: so sach ky ((nang xa) or (nang x)) hoi. hieu ve cham soc va hang ((tai va) or (tri va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang x)) hoi. hieu ve cham soc va hang ((tai va) OR (tri va)) thiet.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) or (nang x)) hoi. hieu ve cham soc va hang ((tai va) or (tri va)) thiet*.