Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang hai » dang khai, hang hai, dung hai
dan khai » dang khai, van khai, dang khoi
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
te sach » toc sach
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa

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