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
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ha hoi » ha noi, xa hoi, va hoi
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang ((ha hoi) OR (hoa hoi)). hieu ve cac duc va thanh lap ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ((ha hoi) OR (hoa hoi)). hieu ve cac duc va thanh lap ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang ((ha hoi) OR (hoa hoi)). hieu ve cac duc va thanh lap ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ((ha hoi) OR (hoa hoi)). hieu ve cac duc va thanh lap ((cua triet) or (cua viet))*.