Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
cac duc » cac du, cao duc, cac dac
duc gia » quoc gia
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
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 noi. ((hieu ve) or (hieu va)) cac duc gia thanh lap ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ha noi. ((hieu ve) OR (hieu va)) cac duc gia thanh lap ((su triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ha noi. ((hieu ve) or (hieu va)) cac duc gia thanh lap ((su triet) or (va trien))*.