Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cach thuc » anh thuc
van hang » van khang, van hoang, van thang
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
lang xa » lang ha, lang van
cac thu » cac thoi
hang ki » hang di, hang ke, hang vi
su sach » so sach, vu sach
sach 2 » sach y
ki su » ky 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 2 ((lang xa) or (dang xay)) hoi. hieu vien ((cach thuc) OR (cac thu)) van hang ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 ((lang xa) OR (dang xay)) hoi. hieu vien ((cach thuc) OR (cac thu)) van hang ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 ((lang xa) or (dang xay)) hoi. hieu vien ((cach thuc) OR (cac thu)) van hang ki su triet".
• Adding a wildcard symbol may retrieve word variants: su sach 2 ((lang xa) or (dang xay)) hoi. hieu vien ((cach thuc) OR (cac thu)) van hang ki su triet*.