Perhaps you should try some spelling variations:
hien luat » hieu luat, hieu suat
hieu hien » bieu hien, dieu hien, chieu chien
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
luat luc » luat tuc, luat duoc, luat lich
hanh doi » thanh doi, hanh noi, hang doi
tu sach » thu sach, su sach, te sach
lai hoi » dai hoi, lai roi, mai hoi
lai hoa » dai hoa, loai hoc
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang ((lai hoi) or (lai hoa)). hieu hien luat luc va hanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang ((lai hoi) OR (lai hoa)). hieu hien luat luc va hanh doi cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang ((lai hoi) or (lai hoa)). hieu hien luat luc va hanh doi cua vat*.