Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
dieu cua » dieu tra
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
cau duc » cao duc, chu duc, cau truc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
thai ky » thoi ky, than ky, thai ly
dai ky » dan ky, dai ly, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((dai ky) or (thai ky)) nang xa hoi. hieu ve ((cau duc) OR (cau luc)) van hanh dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((dai ky) OR (thai ky)) nang xa hoi. hieu ve ((cau duc) OR (cau luc)) van hanh dieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((dai ky) or (thai ky)) nang xa hoi. hieu ve ((cau duc) OR (cau luc)) van hanh dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((dai ky) or (thai ky)) nang xa hoi. hieu ve ((cau duc) OR (cau luc)) van hanh dieu cua tre*.