Perhaps you should try some spelling variations:
tuan vien » tuan tien, xuan vien, tuan kien
vien cua » viec cua, dien cua, tien cua
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
vu cham » va cham, vu kham, tu cham
sang ky » sang kyo, dang ky, bang ky
hieu vu » hieu va, hieu ve, hieu su
lang ha » long ha
tang ky » dang ky, trong ky, tang khu
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 ((sang ky) OR (tang ky)) lang ha noi. hieu vu cham ((xuc van) or (vuc van)) tuan vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sang ky) OR (tang ky)) lang ha noi. hieu vu cham ((xuc van) OR (vuc van)) tuan vien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sang ky) OR (tang ky)) lang ha noi. hieu vu cham ((xuc van) or (vuc van)) tuan vien cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sang ky) OR (tang ky)) lang ha noi. hieu vu cham ((xuc van) or (vuc van)) tuan vien cua tre*.