Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
suu viet » su viet, sau viet, so viet
hanh dao » lanh dao, thanh dat, thanh dam
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » lieu va, hieu qua
tang ma » tang van
co xuc » co xuoc, co xua
xuc va » duc va, tuc va, luc va
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 sach ky ((tang ma) or (mang may)) hoi. hieu va co xuc va hanh dao ((suu viet) or (sieu viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((tang ma) OR (mang may)) hoi. hieu va co xuc va hanh dao ((suu viet) OR (sieu viet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((tang ma) or (mang may)) hoi. hieu va co xuc va hanh dao ((suu viet) or (sieu viet))*.