Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
su triet » su viet, su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
pham duy » pham duc
sach tu » sach thu, cach tu, sach uu
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang xa » nang x, nang ma, mang xa
sach ty » sach y, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
di su » doi su, ki su, da su

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) or (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve pham duy vat thanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve pham duy vat thanh di su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach ty)) ((nang xa) OR (lang xa)) hoi. hieu ve pham duy vat thanh di su triet*".