Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
va cam » va cham, va cac, va cao
va va » va van, va vua, va vai

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