Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
quan cau » quang cao, toan cau, quan ha
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
cau chu » cau chiu, ca chu, cac chu
chu van » cuu van, chu han
cua tuc » cua duc, cua tu, cua thuoc
y lang » o lang, _ lang, tay lang
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 y lang ((van hoi) OR (van hoc)). hieu quan cau chu van hanh vi ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang ((van hoi) OR (van hoc)). hieu quan cau chu van hanh vi ((cua te) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang ((van hoi) OR (van hoc)). hieu quan cau chu van hanh vi ((cua te) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang ((van hoi) OR (van hoc)). hieu quan cau chu van hanh vi ((cua te) or (cua tuc))*.