Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
suu viet » sau viet, sieu viet, so viet
va tinh » may tinh
su viet » so viet
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
co tuc » co thuc, co tu, co toc
te sac » te sach, te cac, te san
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xa hoi. hieu va co tuc ((ban thanh) or (va tinh)) dao ((suu viet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. hieu va co tuc ((ban thanh) OR (va tinh)) dao ((suu viet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang xa hoi. hieu va co tuc ((ban thanh) or (va tinh)) dao ((suu viet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xa hoi. hieu va co tuc ((ban thanh) or (va tinh)) dao ((suu viet) OR (su viet))*.