Perhaps you should try some spelling variations:
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
han tai » hang tai, nhan tai, van tai
xuc va » tuc va, luc va, xac va
tai va » thai va, mai va, tri 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 (co sach)) ky nang xa hoi. hieu ve cham ((xuc va) or (duc va)) han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang xa hoi. hieu ve cham ((xuc va) OR (duc va)) han tai va thiet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang xa hoi. hieu ve cham ((xuc va) or (duc va)) han tai va thiet*.