Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van hac » van hoc, van ha, van hai
hac duc » hoc duc, ha duc, thach duc
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 ((ma hoi) OR (xa hoi)). hieu van hac duc van hanh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((ma hoi) OR (xa hoi)). hieu van hac duc van hanh vi cua tu*.