Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
dang xay » dang van, van xay
cam duc » cam xuc, cao duc, pham duc
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
tu bai » tu ban, tu bat, te bai
dan vi » doan vi, don vi, dan va
bai ky » ban ky, sai ky, bac ky
cua tu » cua tuc, cua su, cua cu

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

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