Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
trang va » tran van, hang va
cong van » cong vang, cong san, song van
tang va » tang van, thang va, tang vat
tai cao » thai cao, tai sao, tai cac
tao cao » bao cao, toan cao

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 - hanh ((tang va) or (trang va)) thong cong van ((tai cao) OR (tao cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh ((tang va) OR (trang va)) thong cong van ((tai cao) OR (tao cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh ((tang va) or (trang va)) thong cong van ((tai cao) OR (tao cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh ((tang va) or (trang va)) thong cong van ((tai cao) OR (tao cao))*.