Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va
van hoi » van hoa, van hoc, van hoe
so lang » o lang, so dang, hoa lang
lo lang » o lang, le lang, hoa lang
luc va » duc va, tuc va, loc va
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: tu sach ((lo lang) or (so lang)) van hoi. ((hieu va) OR (hieu qua)) cac luc va hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo lang) OR (so lang)) van hoi. ((hieu va) OR (hieu qua)) cac luc va hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo lang) or (so lang)) van hoi. ((hieu va) OR (hieu qua)) cac luc va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo lang) or (so lang)) van hoi. ((hieu va) OR (hieu qua)) cac luc va hanh dai cua te*.