Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
toc sach » hoc sach, doc sach, thuoc sach
chat duc » chat xuc, chat doc, chet duoc
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
duc van » duc va, duc tan, duc manh
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
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 ky nang ((xa hoi) or (((mai hoi) OR (mai khoi)))). hieu ve chat duc van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((xa hoi) OR (((mai hoi) OR (mai khoi)))). hieu ve chat duc van hanh le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((xa hoi) or (((mai hoi) OR (mai khoi)))). hieu ve chat duc van hanh le cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((xa hoi) or (((mai hoi) OR (mai khoi)))). hieu ve chat duc van hanh le cua tre*.