Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van nhan » van phan, van thanh, danh nhan
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
tu tieng » luc tieng, tu tuong, tu trong
sach ky » sac ky, sach y, sach ty
va nhan » ca nhan, va phan, va nha
duc van » duc va, duc tan, duc manh
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: thu sach ky nang x hoi. hieu ((va nhan) OR (van nhan)) duc van hanh vi ((va triet) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((va nhan) OR (van nhan)) duc van hanh vi ((va triet) OR (tu tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((va nhan) OR (van nhan)) duc van hanh vi ((va triet) or (tu tieng))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((va nhan) OR (van nhan)) duc van hanh vi ((va triet) or (tu tieng))*.