Perhaps you should try some spelling variations:
ban thanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, dam thuc
y lang » o lang, _ lang, tay lang
vi cua » vai cua, di cua

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 y lang xa hoi. hieu va ((cam tuc) or (nam thuc)) ((ban thanh) OR (ban hanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. hieu va ((cam tuc) OR (nam thuc)) ((ban thanh) OR (ban hanh)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. hieu va ((cam tuc) or (nam thuc)) ((ban thanh) OR (ban hanh)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu va ((cam tuc) or (nam thuc)) ((ban thanh) OR (ban hanh)) vi cua viet*.