Perhaps you should try some spelling variations:
cham loc » cham soc, chon loc, cham o
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van cham » van chat, van tham, va cham
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
ban ky » van ky, dan ky
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
tu ban » thu ban, te ban

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

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