Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tranh cua » doanh cua, manh cua
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
hieu van » hieu va, thien van, lieu va
tac tan » tac can, tac van, tat tan
tan ban » toan ban, tang ban, van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (hieu van)) - canh tranh cua ((cong cong) OR (dung cong)) tac tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu van)) - canh tranh cua ((cong cong) OR (dung cong)) tac tan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (hieu van)) - canh tranh cua ((cong cong) OR (dung cong)) tac tan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu van)) - canh tranh cua ((cong cong) OR (dung cong)) tac tan ban*.