Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
hien hanh » dieu hanh
tang luan » dung luan
trong van » trong cac
tang cua » mang cua, hang cua, thong cua
van tuan » van quan, van ban, anh tuan
tuan tap » toan tap, tuan tai, tuyen tap

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 hanh - hanh ((tang cua) or (tang luan)) cong trong van tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - hanh ((tang cua) OR (tang luan)) cong trong van tuan tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh ((tang cua) or (tang luan)) cong trong van tuan tap*.