Perhaps you should try some spelling variations:
qua pham » quan pham, quy pham, qua cham
pham duy » pham duc
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
su triet » su viet, su tien, 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
duy va » duy vat, duy van, day va
thiet » thieu

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