Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh vi cua cu*.