Perhaps you should try some spelling variations:
sach kha » sach nha, sach ha, sach tham
kha nang » phap nang, ky nang, ki nang
te sach » toc sach
van dam » van nam, van dao, van dau
van lam » van nam
su tien » su kien, su hien, tu tieng
va dap » va dao, va dau
ca dan » cac dan, ca dao
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: te sach kha nang x hoi. hieu ((van dam) or (van lam)) duc ((va dap) or (ca dan)) va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach kha nang x hoi. hieu ((van dam) OR (van lam)) duc ((va dap) OR (ca dan)) va su tien.
• Adding a wildcard symbol may retrieve word variants: te sach kha nang x hoi. hieu ((van dam) or (van lam)) duc ((va dap) or (ca dan)) va su tien*.