Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ve triet » va trien, su triet
nang may » mang may, nang ma, bang may
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam tu, nam thuc, dam thuc
hieu ve » hieu va, hieu van
may hoi » may thoi, tay hoi, mai hoi
vi ve » va ve, gi ve, ve ve

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

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