Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
hieu te » hieu ve, hien te, hieu he
ban co » ban do, san co
te ban » te bao
vi cu » vi su, vi du
vi xu » va xu, ve xu, vi su

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 ky nang x ho. hieu te ban co ((va hanh) or (va thanh)) ((vi cu) OR (vi xu)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x ho. hieu te ban co ((va hanh) OR (va thanh)) ((vi cu) OR (vi xu)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x ho. hieu te ban co ((va hanh) or (va thanh)) ((vi cu) OR (vi xu)) tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x ho. hieu te ban co ((va hanh) or (va thanh)) ((vi cu) OR (vi xu)) tren*.