Perhaps you should try some spelling variations:
cua triet » su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
cua viet » ca viet, hoa viet, cua vat
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
ty hang » ly hang, ty xang, thi hang
van bac » van ban, van bao, van hac
bac dan » bach dan, cac dan, ban dan
ty nang » ky nang, ty xang, ly nang
tu sach » thu sach, su sach, te sach
dan va » doan va, dan ca, ban va
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: tu sach ((ty nang) or (ty hang)) x hoi. hieu van bac dan va thanh lap ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) x hoi. hieu van bac dan va thanh lap ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty hang)) x hoi. hieu van bac dan va thanh lap ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) x hoi. hieu van bac dan va thanh lap ((cua triet) OR (cua viet))*.