Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
sac ky » cac ky
cac co » cac cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) OR (sai ky)) nang xa hoi. hieu viec cac co ((van hanh) or (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang xa hoi. hieu viec cac co ((van hanh) OR (ban hanh)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) nang xa hoi. hieu viec cac co ((van hanh) or (ban hanh)) vai cuu tre*".