Perhaps you should try some spelling variations:
cua triet » su triet, va triet
tay lang » tai lang, tay tang, tay quang
ban hanh » ban hang
hanh lam » thanh lap, hanh kem, hanh va
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
y lang » o lang, _ lang, yen lang

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 ((y lang) or (tay lang)) xa hoi. lieu va cac cuc ban hanh lam ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y lang) OR (tay lang)) xa hoi. lieu va cac cuc ban hanh lam ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y lang) or (tay lang)) xa hoi. lieu va cac cuc ban hanh lam ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y lang) or (tay lang)) xa hoi. lieu va cac cuc ban hanh lam ((cua triet) OR (cua viet))*.