Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chat tinh » chau tinh, cha tinh, chai tinh
cham tinh » chau tinh, cham binh, ha tinh
trang va » hang va
tran van » luan van
cong anh » cong danh, dong anh, hong anh
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 ((chat tinh) OR (cham tinh)) - hanh ((trang va) OR (tran van)) nhung cong anh tuan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chat tinh) OR (cham tinh)) - hanh ((trang va) or (tran van)) nhung cong anh tuan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chat tinh) OR (cham tinh)) - hanh ((trang va) or (tran van)) nhung cong anh tuan ban*.