Perhaps you should try some spelling variations:
phuong thong » phuong trong, thong thong, phuong hoang
hieu lang » chieu sang, hieu quang, nhieu tang
trinh vat » trinh van, trinh luat, sinh vat
thong tan » thong than, thong tran, thong tin
trinh va » trinh van, trinh ve, trinh vi
van chat » cao chat
ho hieu » ho chieu, hoi hieu, nho hieu
tan van » tran van, tang van, luan van

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((trinh va) OR (trinh vat)) phuong thong tan van chat~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trinh va) OR (trinh vat)) phuong thong tan van chat*.