Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet
pham duy » pham duc
thanh di » thanh doi, thanh de, thanh do
va triet » va thiet, va trien, ve triet
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 triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang xa hoi. hieu va pham duy vat thanh di ((cua triet) OR (va triet))".
• 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 triet))*.