Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tung tuan » trung tuan, hung tuan, quang tuan
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
huy toan » huy tran, huu toan, huy hoang
ty toan » ly toan, tap toan, tam toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chieu tinh)) - thanh tung tuan dung cong ((ty toan) OR (huy toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu tinh)) - thanh tung tuan dung cong ((ty toan) OR (huy toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu tinh)) - thanh tung tuan dung cong ((ty toan) OR (huy toan)) cau*.