Perhaps you should try some spelling variations:
hanh trong » hanh trang, anh trong, hinh trong
thien hach » thien thanh, hien hanh
dien sach » dien anh
trong xay » thong xay, trong cac, trong ca
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dien sach) or (thien hach)) - hanh trong xay dung cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien sach) OR (thien hach)) - hanh trong xay dung cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((dien sach) or (thien hach)) - hanh trong xay dung cong tan van ban*.