Perhaps you should try some spelling variations:
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
te sach » toc sach
van hoi » van hoa, van hoc, van hoe
o lang » hoa lang, hoi lang
v lang » va lang, _ lang, van lang
cua tu » cua tuc, cua su, cua cu

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