Perhaps you should try some spelling variations:
suu viet » su viet, sau viet, sieu viet
hanh dao » thanh dat, thanh dam, doanh dao
sach ky » sac ky, sach y, sach ty
tuc van » thuc van, truc van, tuc va
te sach » toc sach
hieu va » lieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
co tuc » co thuc, co tu, co toc

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