Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
trong cao » truong cao, trong cac, trong cay
hien anh » thien anh, dien anh, tien anh
trong ca » trong cac, trong nha
cong san » cong tac
san van » tan van, luan van, tran 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 ((hien anh) or (hien hanh)) - hanh ((trong cao) or (trong ca)) thong cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (hien hanh)) - hanh ((trong cao) OR (trong ca)) thong cong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) or (hien hanh)) - hanh ((trong cao) or (trong ca)) thong cong san van ban*.