Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet, va triet
pham duy » pham duc
thanh di » thanh doi, thanh de, thanh do
va trien » va truyen, va thiet, va tuyen
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap

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 tu nang xa hoi. hieu va pham duy vat thanh di ((cua triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. hieu va pham duy vat thanh di ((cua triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. hieu va pham duy vat thanh di ((cua triet) or (va trien))*.