Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham day » phap day, pham duy, pham xay
toan tap » toan ban
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va pham » van pham, va phat, va phap
va toan » van toan, bai toan, tap toan
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (hoc sinh)) ky nang xa hoi. lieu va pham day va toan tap ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sinh)) ky nang xa hoi. lieu va pham day va toan tap ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sinh)) ky nang xa hoi. lieu va pham day va toan tap ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sinh)) ky nang xa hoi. lieu va pham day va toan tap ((cua tre) OR (cua triet))*.