Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat luc » chat xuc, chat lua, nhan luc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
van anh » van thanh, tuan anh
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

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