Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
qua cua » quan cua, quang cua, qua quan
cua duc » cua tuc, cua nuoc, cua quoc
duc van » duc va, duc tan, duc manh
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky dang xay hoi. hieu qua cua duc van hanh ((di cua) or (dai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky dang xay hoi. hieu qua cua duc van hanh ((di cua) OR (dai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu dan ky dang xay hoi. hieu qua cua duc van hanh ((di cua) or (dai cua)) viet*.