Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham duc » pham duc, tham du, than duc
ban hanh » ban hang
sach ky » sach y, sach ty, sach kem
va tham » van tham, va cham, va thanh
duc ban » duc tan, duc van, dua ban
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) OR (sac ky)) nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang ((o hoc) OR (xa hoi)). lieu va tham duc ban hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) OR (sac ky)) nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) OR (sac ky)) nang ((o hoc) or (xa hoi)). lieu va tham duc ban hanh di cua triet*.