Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
thu sac » thu sach, thu san, thu xac
lang xa » lang ha, lang van
van cam » van nam, van lam, van cau
duc van » duc va, duc manh, duc phan
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 van) or (duc tan)) thanh dai 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 van) OR (duc tan)) thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((lang xa) or (dang xay)) hoi. hieu van cam ((duc van) or (duc tan)) thanh dai cua tre*.