Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, hieu ca
truong va » truong dai, truong cao, truong dao
toc hieu » toc thieu, doc hieu, hoc thieu
trung va » trang va, trung ha, trung tam
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) OR (truong 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) OR (truong va)) thong cong dan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu cach - thanh ((trung va) OR (truong va)) thong cong dan ((phan cau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: toc hieu cach - thanh ((trung va) OR (truong va)) thong cong dan ((phan cau) or (phan tu))*.