Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
tai va » thai va, mai va, dai va
x hoi » xa hoi, o hoi, x ho
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 nang x hoi. hieu vu cham ((xuc van) or (duc van)) han ((tai va) or (tri va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu vu cham ((xuc van) OR (duc van)) han ((tai va) OR (tri va)) thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu vu cham ((xuc van) or (duc van)) han ((tai va) or (tri va)) thiet*.