Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

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