Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
vien cua » viec cua, dien cua, tien cua
duc van » duc va, duc tan, duc manh
vuc van » luc van, thuc van, chuc van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
tang ky » trong ky, tang khu
tang ha » lang ha, tang ma, trung ha
dang ky » dang y, dan ky, dong ky
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((tang ky) OR (dang ky)) tang ha noi. hieu vu cham ((vuc van) or (duc van)) thanh vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((tang ky) OR (dang ky)) tang ha noi. hieu vu cham ((vuc van) OR (duc van)) thanh vien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((tang ky) OR (dang ky)) tang ha noi. hieu vu cham ((vuc van) or (duc van)) thanh vien cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((tang ky) OR (dang ky)) tang ha noi. hieu vu cham ((vuc van) or (duc van)) thanh vien cua tre*.