Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cao duc » dao duc, cao suc, giao duc
va chua » vua chua, ca chua, va chu
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac duc » cac du, cac dac, cac nuoc
nang xa » nang x, lang xa, nang ma
ca cua » co cua

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 nang xa hoi. thieu bien ((cac duc) OR (cao duc)) va hanh ((va chua) or (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. thieu bien ((cac duc) OR (cao duc)) va hanh ((va chua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. thieu bien ((cac duc) OR (cao duc)) va hanh ((va chua) or (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. thieu bien ((cac duc) OR (cao duc)) va hanh ((va chua) or (ca cua)) triet*.