Perhaps you should try some spelling variations:
khai luoc » hai huoc, hai luom, dai luoc
vien khai » bien khai, trien khai, vien dai
nhung thi » nhung thoi, phung thi, nhung tri
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dung tri » dung tai, dung tren, dung sai
hieu cac » hieu luc, hieu va, hieu van
tri que » tri tue, tri quan, tren que
thi qua » thi quan, thi dua, thi cua
qua san » qua ban, cua san, qua van
que van » qua van, quy van, quyet van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( dung tri que van. biet the hieu cac nuoc ) OR ( nhung thi qua san. biet the vien khai luoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( dung tri que van. biet the hieu cac nuoc ) or ( nhung thi qua san. biet the vien khai luoc ))*.