Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
xuc van » duc van, luc van, xuc ban
cac xuc » cam xuc, cac nuoc, chat xuc
mai hoi » mai khoi, dai hoi, lai hoi
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty nang ((ma hoi) OR (mai hoi)). hieu ve cac xuc van hanh vi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ((ma hoi) OR (mai hoi)). hieu ve cac xuc van hanh vi cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang ((ma hoi) OR (mai hoi)). hieu ve cac xuc van hanh vi cua cu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang ((ma hoi) OR (mai hoi)). hieu ve cac xuc van hanh vi cua cu*.