Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cam luc » cam xuc
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
hang x » hoang xa, chang xu, hang nxb
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thue ((hang x) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) van hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thue ((hang x) OR (nang x)) hoi. hieu ve ((cam luc) OR (cau luc)) van hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thue ((hang x) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) van hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach thue ((hang x) OR (nang x)) hoi. hieu ve ((cam luc) or (cau luc)) van hanh vi cua tu*.