Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc dieu
hanh tang » hanh trang, anh tang, hanh mang
cong san » cong tac
tran ban » tranh ban, tran van, tran bai
toan ban » van ban
tang va » trang va, tang van, thang va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) tinh - hanh tang va nhung cong san ((tran ban) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (hoc hien)) tinh - hanh tang va nhung cong san ((tran ban) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (hoc hien)) tinh - hanh tang va nhung cong san ((tran ban) or (toan ban))*.