Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dang xay » dang van, van xay
hien cac » thien cac, vien cac, hieu cac
cac thuc » cach thuc, cac thu, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
lang xa » lang ha, lang van
sach v » sach va, sach y, sach 2
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: su sach v ((lang xa) or (dang xay)) hoi. hieu hien cac thuc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((lang xa) OR (dang xay)) hoi. hieu hien cac thuc van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach v ((lang xa) or (dang xay)) hoi. hieu hien cac thuc van hanh vi su triet*.