Perhaps you should try some spelling variations:
che chinh » te chinh
nhan tai » hang tai, van tai, toan tai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
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 ty nang xa hoi. hieu ((che chinh) or (va cham)) ((xuc va) or (duc va)) nhan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((che chinh) OR (va cham)) ((xuc va) OR (duc va)) nhan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((che chinh) or (va cham)) ((xuc va) or (duc va)) nhan tai va thiet*.