Perhaps you should try some spelling variations:
hieu cach » hieu cac, chieu sach, hieu ca
hoc hieu » hoc thieu, hoc hien, doc hieu
cao cong » cac cong, cao dang, cua cong
cong san » cong tac
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban
ca cong » cua cong, cac cong, cau cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - hanh chinh ((ca cong) OR (cao cong)) cong san ((toan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - hanh chinh ((ca cong) OR (cao cong)) cong san ((toan tai) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - hanh chinh ((ca cong) OR (cao cong)) cong san ((toan tai) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - hanh chinh ((ca cong) OR (cao cong)) cong san ((toan tai) or (toan tap))*.