Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tien manh » tien thanh, tieng anh, tran manh
tien anh » tieng anh, dien anh, tien thanh
tranh va » tranh van, trang va, trinh va
tran van » luan van
cong can » cong san, cong tan, cong dan
can chan » dan chan, cam chan, ban chan
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien anh) or (tien manh)) - canh ((tranh va) or (tran van)) thong cong can chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (tien manh)) - canh ((tranh va) OR (tran van)) thong cong can chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (tien manh)) - canh ((tranh va) or (tran van)) thong cong can chan cau*.