Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
canh thuc » anh thuc, cach thuc, danh thuc
vien canh » bien canh, vien can, vien nganh
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
dang xay » dang van, van xay
lang xa » lang ha, lang van
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2

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 vien canh thuc van hang ((ki su) OR (ky 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 vien canh thuc van hang ((ki su) OR (ky su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((lang xa) or (dang xay)) hoi. hieu vien canh thuc van hang ((ki su) OR (ky su)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach v ((lang xa) or (dang xay)) hoi. hieu vien canh thuc van hang ((ki su) OR (ky su)) triet*.