Perhaps you should try some spelling variations:
sach ly » sach y, sach ty, sach hay
sach lo » sach dao, sach doi, sach hoi
van dau » phan dau
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
o hoi » co hoi, o hoc, o hai

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 ly) OR (sach lo)) nang o hoi. hieu ((van dau) or (van dao)) duc va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ly) OR (sach lo)) nang o hoi. hieu ((van dau) OR (van dao)) duc va hanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ly) OR (sach lo)) nang o hoi. hieu ((van dau) or (van dao)) duc va hanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: te ((sach ly) OR (sach lo)) nang o hoi. hieu ((van dau) or (van dao)) duc va hanh di cua vat*.