Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach tay » sach hay, sach nay, sach tai
xach tay » canh tay
doan vi » doan va, doan thi, doan van
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach tay) OR (xach tay)) lang xa hoi. hieu ve cac tu va ((don vi) or (doan vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tay) OR (xach tay)) lang xa hoi. hieu ve cac tu va ((don vi) OR (doan vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tay) OR (xach tay)) lang xa hoi. hieu ve cac tu va ((don vi) or (doan vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach tay) OR (xach tay)) lang xa hoi. hieu ve cac tu va ((don vi) or (doan vi)) cua triet*.