Perhaps you should try some spelling variations:
phat tinh » phap tinh, phat minh, pha tinh
cong danh » cuong danh, cong dan, cong thanh
hoc phat » hoc phan, hoc pho
trang va » hang va
tran van » luan van
cong anh » dong anh, hong anh, cong thanh
tuan ban » tuan bang, toan ban, luan ban

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: hoc phat tinh - hanh ((trang va) OR (tran van)) nhung ((cong anh) OR (cong danh)) tuan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc phat tinh - hanh ((trang va) or (tran van)) nhung ((cong anh) OR (cong danh)) tuan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc phat tinh - hanh ((trang va) or (tran van)) nhung ((cong anh) OR (cong danh)) tuan ban*.