Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
sach tay » xach tay, sach hay, sach nay
hieu van » thien van, lieu va, hieu ve
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 ((lang xa) or (dang xay)) hoi. ((hieu van) OR (hieu va)) cam tuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tay ((lang xa) OR (dang xay)) hoi. ((hieu van) OR (hieu va)) cam tuc va hanh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tay ((lang xa) or (dang xay)) hoi. ((hieu van) OR (hieu va)) cam tuc va hanh vi cua triet*".