Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
yen lang » den lang, ten lang, yen giang
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
quan cau » quang cao, toan cau, quan ha
cau luc » cau truc, cau phuc
te sach » toc sach
van hoc » van hoa
o lang » hoa lang, hoi 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: te sach ((yen lang) or (o lang)) van hoc. hieu quan cau luc va thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((yen lang) OR (o lang)) van hoc. hieu quan cau luc va thanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((yen lang) or (o lang)) van hoc. hieu quan cau luc va thanh vi cua te*.