Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
truong cua » truong ca, truong quan, truong cao
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doc hieu » toc thieu, hoc thieu, hoc hien
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cao » toan ban, toan tap

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 manh - hanh ((trung tuan) or (truong cua)) thong cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh ((trung tuan) OR (truong cua)) thong cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh ((trung tuan) or (truong cua)) thong cong tap toan cao*.