Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
vu cham » vu kham, tu cham, qua cham
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
tai va » thai va, mai va, tri va
va han » va phan, van han, va hang
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 ((vu cham) or (va cham)) xuc ((va han) OR (va hanh)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((vu cham) OR (va cham)) xuc ((va han) OR (va hanh)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ((vu cham) or (va cham)) xuc ((va han) OR (va hanh)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((vu cham) or (va cham)) xuc ((va han) OR (va hanh)) tai va thiet*.