Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
thong dang » thong dung, thong mang, thong nang
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
thong dan » thong van, tuong dan, thong den
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (hieu manh)) - hanh trung cua thong ((thong dang) OR (thong dan)) tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu manh)) - hanh trung cua thong ((thong dang) OR (thong dan)) tran cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (hieu manh)) - hanh trung cua thong ((thong dang) OR (thong dan)) tran cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (hieu manh)) - hanh trung cua thong ((thong dang) OR (thong dan)) tran cao*.