Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung dung » phuong dung, ung dung, thong dung
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung cap, dung cua
hoc hieu » hoc thieu, hoc hien, doc hieu
dung anh » dung danh, duong anh, dong anh
tuan ban » tuan bang, luan ban, quang ban
toan ban » van ban

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

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