Perhaps you should try some spelling variations:
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
van lam » van nam
van cam » van nam, van cau, van dam
sach ky » sach y, sach ty, sach kem
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di 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: su ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cam) or (van lam)) luc va danh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cam) OR (van lam)) luc va danh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cam) or (van lam)) luc va danh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang o hoi. hieu ((van cam) or (van lam)) luc va danh vi cua vat*.