Perhaps you should try some spelling variations:
dang xay » dang van, van xay
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
cac duc » cac du, cac dac, cac nuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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 y ((nang xa) or (dang xay)) hoi. hieu va ((cac duc) OR (cao duc)) va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (dang xay)) hoi. hieu va ((cac duc) OR (cao duc)) va hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (dang xay)) hoi. hieu va ((cac duc) OR (cao duc)) va hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (dang xay)) hoi. hieu va ((cac duc) OR (cao duc)) va hanh di cuu tre*.