Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
tay lang » tai lang, tay tang, tay quang
quan cau » quang cao, toan cau, quan ha
tu sach » thu sach, su sach, te sach
van hoi » van hoa, van hoc, van hoe
cau luc » cau truc, cau phuc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y lang » o lang, _ lang, yen lang
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
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) or (tay lang)) van hoi. hieu quan cau luc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (tay lang)) van hoi. hieu quan cau luc va danh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) or (tay lang)) van hoi. hieu quan cau luc va danh vi cua te*.