Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat tuc » chat xuc, luat tuc, chat huu
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
tuc van » thuc van, truc van, tuc va
cua tre » cuu tre, cua triet, dua tren
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((y lang) OR (_ lang)) van hoa. hieu ve chat tuc van hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y lang) OR (_ lang)) van hoa. hieu ve chat tuc van hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y lang) OR (_ lang)) van hoa. hieu ve chat tuc van hanh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y lang) OR (_ lang)) van hoa. hieu ve chat tuc van hanh vi ((cua tre) or (cua te))*.