Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
dac trung » duc trung, cac truong, tai trung
quan dac » luan dac, quan doc, quan doan
quoc anh » quoc danh, quoc hanh, nuoc anh
viec dat » vien dai, vien da, viec lam
thu xac » thau xay
viet da » viet dao, viet dat, viet ha
xac ky » cac ky, sac ky, bac ky
ky anh » ky danh, ly anh, ty anh
anh xa » anh xay, canh xa, anh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu xac ky anh xa hoi. hieu quan dac trung quoc anh ((viec dat) or (viet da)) tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu xac ky anh xa hoi. hieu quan dac trung quoc anh ((viec dat) OR (viet da)) tao.
• Adding a wildcard symbol may retrieve word variants: thu xac ky anh xa hoi. hieu quan dac trung quoc anh ((viec dat) or (viet da)) tao*.