Perhaps you should try some spelling variations:
khao hoat » khao sat, cao hoat, khao ha
van thanh » ban thanh, van tuan
manh cua » doanh cua, ban cua
mang cua » dung cua, ban cua, cong cua
hoat van » hoa van, hat van, hoang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
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 xa hoi. ((hieu va) or (hieu ve)) khao hoat van thanh ((mang cua) OR (manh cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. ((hieu va) OR (hieu ve)) khao hoat van thanh ((mang cua) OR (manh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xa hoi. ((hieu va) or (hieu ve)) khao hoat van thanh ((mang cua) OR (manh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. ((hieu va) or (hieu ve)) khao hoat van thanh ((mang cua) OR (manh cua)) tre*.