Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hanh than » hanh han, hanh nhan, hanh phan
toc sach » hoc sach, doc sach, thuoc sach
than cua » nhan cua, thai cua, ban cua
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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) or (thu sach)) ky nang xa hoi. hieu ve ((cam tuc) or (nam thuoc)) van hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky nang xa hoi. hieu ve ((cam tuc) OR (nam thuoc)) van hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky nang xa hoi. hieu ve ((cam tuc) or (nam thuoc)) van hanh than cua tre*.