Perhaps you should try some spelling variations:
sau viet » su viet, dau viet, sau biet
suu viet » su viet, sieu viet, so viet
hanh dao » lanh dao, thanh dat, thanh dam
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
xuc va » duc va, tuc va, xac va
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi. hieu va cao ((xuc va) or (luc va)) hanh dao ((suu viet) OR (sau viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ma hoi. hieu va cao ((xuc va) OR (luc va)) hanh dao ((suu viet) OR (sau viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ma hoi. hieu va cao ((xuc va) or (luc va)) hanh dao ((suu viet) OR (sau viet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ma hoi. hieu va cao ((xuc va) or (luc va)) hanh dao ((suu viet) OR (sau viet))*.