Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
dong hoa » dong hoc, dong co
hoa hoi » khoa hoi, hoa hoc, hoa doi
va tham » van tham, va thanh, va thuat
sach ky » sac ky, sach y, sach ty
va cham » va chat
xuc van » duc van, luc van, vuc van
ky dong » ly dong, ky dang, ky cong
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky dong hoa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky dong hoa hoi. hieu ((va tham) OR (va cham)) xuc van hanh vi ((cua te) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky dong hoa hoi. hieu ((va tham) or (va cham)) xuc van hanh vi ((cua te) or (va triet))*.