Perhaps you should try some spelling variations:
san thanh » ban thanh, van thanh, son thanh
sang tao » hang tai
cac cong » cua cong
cong san » cong tac
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua dieu
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, tay hoi
qua cac » cua cac
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky sang tao hoi. hieu qua cac cong san thanh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang tao hoi. hieu qua cac cong san thanh vi ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: te sac ky sang tao hoi. hieu qua cac cong san thanh vi ((cua viet) or (cua vat))*.