Perhaps you should try some spelling variations:
thanh hoai » thanh hoa, thanh hai, thanh oai
tan thanh » tran thanh, tang thanh, toan thanh
cua triet » cua viet, su triet, va triet
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cua tre » cua te, cuu tre, dua tren
tu sai » tu bai, tu cai, tu lai
tu san » thu san, tu ban, tu can
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 sai) or (tu san)) ky nang x hoi. hieu va pham duc tan thanh hoai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu san)) ky nang x hoi. hieu va pham duc tan thanh hoai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) or (tu san)) ky nang x hoi. hieu va pham duc tan thanh hoai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu san)) ky nang x hoi. hieu va pham duc tan thanh hoai ((cua tre) OR (cua triet))*.