Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
cua triet » cua viet, su triet, va triet
thu dang » thu hang, thu bang, thu dong
thanh di » thanh doi, thanh de, thanh do
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cuu tre, dua tren
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (tu cach)) ky nang x ho. hieu he nam thu dang thanh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu cach)) ky nang x ho. hieu he nam thu dang thanh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (tu cach)) ky nang x ho. hieu he nam thu dang thanh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu cach)) ky nang x ho. hieu he nam thu dang thanh di ((cua tre) OR (cua triet))*.