Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
can thuc » dan thuc, van thuc, cay thuc
vien can » vien canh, vien cac, vien cao
hang vi » hang va, hanh vi, hang di
vu sach » vu bach, vu khach
su sach » so sach
lang xa » lang ha, lang van
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: ((vu sach) OR (su sach)) v ((lang xa) or (dang xay)) hoi. hieu vien can thuc van hang vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) v ((lang xa) OR (dang xay)) hoi. hieu vien can thuc van hang vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) v ((lang xa) or (dang xay)) hoi. hieu vien can thuc van hang vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) v ((lang xa) or (dang xay)) hoi. hieu vien can thuc van hang vi su triet*.