Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, hieu ca
toc hieu » toc thieu, doc hieu, hoc thieu
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu cach - thanh trung va thong cong dan ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu cach - thanh trung va thong cong dan ((phan cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: toc hieu cach - thanh trung va thong cong dan ((phan cau) or (phan tu))*.