Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van cam » van nam, van lam, van cau
lai cua » dai cua, hai cua, lai chau
duc ban » duc van, dua ban, duc man
thu sac » thu sach, thu san, thu xac
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, 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: thu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cam ((duc ban) or (duc tan)) thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cam ((duc ban) OR (duc tan)) thanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cam ((duc ban) or (duc tan)) thanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((lang xa) OR (dang xay)) hoi. hieu van cam ((duc ban) or (duc tan)) thanh lai cua tre*.