Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
cong toan » cong tan, cong hoan, cong tuan
hoc tien » hoc tieng, hoc hien, hoc vien
tien anh » tieng anh, tien manh, dien anh
tranh va » tranh van, trang va, thanh va
trinh va » trinh van, trinh vat, trinh ve
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 - canh ((tranh va) or (trinh va)) thong cong toan ((phan cau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien anh - canh ((tranh va) OR (trinh va)) thong cong toan ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien anh - canh ((tranh va) or (trinh va)) thong cong toan ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: hoc tien anh - canh ((tranh va) or (trinh va)) thong cong toan ((phan cau) OR (phan dau))*.