Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
hanh trung » thanh trung, hanh trang, manh trung
thong cang » thong cong, khong cang, thong cung
cang thang » cong thanh, dang thanh
hieu luch » hieu luat, hieu cach, hieu tuc
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
thang cau » hang cau, thong cau, thanh chau
hieu luc » hieu luat, hieu qua

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 luc) or (hieu luch)) - hanh trung cua khong thong cang thang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu luc) OR (hieu luch)) - hanh trung cua khong thong cang thang cau*.