Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
pham duy » pham duc
vinh cuu » dinh cuu, sinh cua, dinh cu
su sach » so sach, vu sach
duy ban » uy ban, duy van, duy can
va pham » van pham, va phat, va phap
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
vi cuu » vi luu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va pham duy ban thanh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va pham duy ban thanh ((vi cuu) OR (vinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (lang xa)) hoi. hieu va pham duy ban thanh ((vi cuu) or (vinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va pham duy ban thanh ((vi cuu) or (vinh cuu)) tre*.