Perhaps you should try some spelling variations:
te sach » toc sach
quan li » quan ly, quan tri
quan vi » quan tri, quan doi
cua tuc » cua duc, cua tu, cua thuoc
lang xa » lang ha, dang xay, lang van
sach o » sach lo, sac o, sach y
cam tu » cam thu, nam tu, dam tu
o lang » hoa lang, hoi lang

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 o lang xa hoi. hieu qua ((cam tu) or (cam xuc)) van ((quan vi) or (quan li)) cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang xa hoi. hieu qua ((cam tu) OR (cam xuc)) van ((quan vi) OR (quan li)) cua tuc.
• Adding a wildcard symbol may retrieve word variants: te sach o lang xa hoi. hieu qua ((cam tu) or (cam xuc)) van ((quan vi) or (quan li)) cua tuc*.