Perhaps you should try some spelling variations:
hien hanh » dieu hanh
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
anh tang » anh bang, anh dang, anh sang
anh nang » ganh nang, anh bang, anh dang
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
tuan ban » tuan bang, toan ban, luan ban

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 - ((anh tang) or (anh nang)) ((cua dung) or (qua dung)) cong vang tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - ((anh tang) OR (anh nang)) ((cua dung) OR (qua dung)) cong vang tuan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - ((anh tang) or (anh nang)) ((cua dung) or (qua dung)) cong vang tuan ban*.