Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
tuong dan » huong dan, truong dai, nguong dan
xuong dan » huong dan, xuong san, nguong dan
tung dan » dung dan, huong dan, trung dai
can cau » van cau, ban cau, ca 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 hien hanh - thanh trung cua thong ((((tuong dan) OR (tung dan))) or (xuong dan)) can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - thanh trung cua thong ((((tuong dan) OR (tung dan))) OR (xuong dan)) can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - thanh trung cua thong ((((tuong dan) OR (tung dan))) or (xuong dan)) can cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - thanh trung cua thong ((((tuong dan) OR (tung dan))) or (xuong dan)) can cau*.