Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
vuc van » duc van, luc van, thuc van
han mai » han tai, han mac, tan mai
ban mai » ban moi, ban ma, ban gai
va cam » va cac, va cao, va cai
thiet » thieu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((va cam) OR (va cham)) vuc van ((han mai) OR (ban mai)) va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((va cam) OR (va cham)) vuc van ((han mai) or (ban mai)) va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((va cam) OR (va cham)) vuc van ((han mai) or (ban mai)) va thiet*.