Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van ban
chat duc » chat xuc, chat doc, chet duoc
van anh » van thanh, tuan anh, van minh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((xa hoi) or (mai hoi)). hieu ve chat duc ((van hanh) or (van anh)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((xa hoi) OR (mai hoi)). hieu ve chat duc ((van hanh) OR (van anh)) le cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((xa hoi) or (mai hoi)). hieu ve chat duc ((van hanh) or (van anh)) le cua tre*.