Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
te sach » toc sach
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
cac tuc » cac toc, cac tu, cac tac
dau vai » dau va, dau hai
dau tai » dai tai, dat tai, da tai

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 ((dang xa) or (dang xay)) hoi. lieu va cac tuc xa ((dau vai) OR (dau tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang xa) OR (dang xay)) hoi. lieu va cac tuc xa ((dau vai) OR (dau tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((dang xa) or (dang xay)) hoi. lieu va cac tuc xa ((dau vai) OR (dau tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((dang xa) or (dang xay)) hoi. lieu va cac tuc xa ((dau vai) OR (dau tai)) cua triet*.