Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
va hanh » va thanh, va danh, ban hanh
2 dang » 2 danh, _ dang, o dang
b dang » _ dang, o dang, ban dang
vi cua » vai cua, di cua

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 ((2 dang) or (b dang)) xa hoi. hieu qua cam duc ((va hanh) OR (van hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((2 dang) OR (b dang)) xa hoi. hieu qua cam duc ((va hanh) OR (van hanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((2 dang) or (b dang)) xa hoi. hieu qua cam duc ((va hanh) OR (van hanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((2 dang) or (b dang)) xa hoi. hieu qua cam duc ((va hanh) OR (van hanh)) vi cua triet*.