Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc cac » duoc cac, luoc cac, nuoc cap
so dang » su dang, so dan, so dung
dang ky » dang y, dan ky, dong ky
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
dan da » dan dat, dan ca, dan va
da cua » dai cua, day cua, dan cua
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: so dang ky lang xa hoi. ((hieu quan) or (hieu qua)) cac nuoc cac dan da cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dang ky lang xa hoi. ((hieu quan) OR (hieu qua)) cac nuoc cac dan da cua tu.
• Adding a wildcard symbol may retrieve word variants: so dang ky lang xa hoi. ((hieu quan) or (hieu qua)) cac nuoc cac dan da cua tu*.