Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
pham duy » pham duc
va tinh » may tinh
ve pham » vi pham, v pham, ve phan
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
hieu ve » hieu va, hieu van
ke su » ke suu, ve su, ky 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 hoi. hieu ve pham duy ((va tinh) or (ban thanh)) ke su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach ty)) nang xa hoi. hieu ve pham duy ((va tinh) OR (ban thanh)) ke su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach ty)) nang xa hoi. hieu ve pham duy ((va tinh) or (ban thanh)) ke su triet*.