Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
danh vi » hanh vi, dinh vi, danh di
sach ty » sach y, sach tu, sach thu
te sach » toc sach
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi su » va su, ve su, ki su

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 ty ((lang xa) OR (dang xay)) hoi. hieu va cac ((xuc va) or (luc va)) danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (dang xay)) hoi. hieu va cac ((xuc va) OR (luc va)) danh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang xa) OR (dang xay)) hoi. hieu va cac ((xuc va) or (luc va)) danh vi su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) OR (dang xay)) hoi. hieu va cac ((xuc va) or (luc va)) danh vi su triet*.