Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
van anh » van thanh, tuan anh, van minh
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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) OR (toc sach)) thu nang xa hoi. hieu va cac vuc van anh vi cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thu nang xa hoi. hieu va cac vuc van anh vi cua cu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thu nang xa hoi. hieu va cac vuc van anh vi cua cu*.