Perhaps you should try some spelling variations:
chua triet » cua triet, chua thiet, chua trieu
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
ky lang » ky dang, ky tang, tay lang
van cac » van hac, van cau, van bac
duc ban » duc van, dua ban, duc man
va chua » vua chua, ca chua, va chu

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 ((ky lang) or (ky nang)) xa hoi. hieu van cac ((duc ban) OR (duc tan)) thanh va chua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) xa hoi. hieu van cac ((duc ban) OR (duc tan)) thanh va chua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) or (ky nang)) xa hoi. hieu van cac ((duc ban) OR (duc tan)) thanh va chua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky nang)) xa hoi. hieu van cac ((duc ban) OR (duc tan)) thanh va chua triet*.