Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh di » thanh doi, thanh de, thanh do
pham duy » pham duc
sach thu » sach thue, sach thieu, sach tham
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach tu » cach tu, sach uu, sach xu
sach ty » sach y, xach tay, sach hay
su viet » so viet
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) OR (sach thu)))) nang xa hoi. hieu ve pham duy vat thanh di su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (((sach ty) OR (sach thu)))) nang xa hoi. hieu ve pham duy vat thanh di su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (((sach ty) OR (sach thu)))) nang xa hoi. hieu ve pham duy vat thanh di su viet*".