Perhaps you should try some spelling variations:
ky dang » ky nang, ky danh
dang ha » dong ha, dung ha, lang ha
ve cham » va cham, ve chat, vu cham
tu cham » toc cham, thi cham
cua dan » cua dang, cua ban, ca dan
luu tre » luu tru, cuu tre, luy tre
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ha hoi » hoa hoi, ha noi, xa hoi
dan vi » doan vi, don vi, dan va
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang ha hoi. hieu ((ve cham) or (tu cham)) hoc cua dan vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky dang ha hoi. hieu ((ve cham) OR (tu cham)) hoc cua dan vi luu tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky dang ha hoi. hieu ((ve cham) or (tu cham)) hoc cua dan vi luu tre*.