Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va trien, ve triet, cua triet
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
van chat » cao chat
van cau » van dau, van hau, toan cau
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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 ma hoi. hieu ((van cau) or (van chat)) luc va thanh ve ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoi. hieu ((van cau) OR (van chat)) luc va thanh ve ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ma hoi. hieu ((van cau) or (van chat)) luc va thanh ve ((va triet) OR (va thiet))*".