Perhaps you should try some spelling variations:
truong toan » truong ton, trong toan, truong tan
hanh trinh » canh tranh, hanh chinh
nhung nang » nhung bang, nhung cang, nhung van
nhung lang » nhung van, nhanh lang, nhung cong
luong toan » luong thanh, luong tai, luong tin
tieu xanh » tieu danh, chieu xanh, dieu hanh
trinh va » trinh van, trinh vat, trinh ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - hanh trinh va ((nhung nang) or (nhung lang)) ((luong toan) OR (truong toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh trinh va ((nhung nang) OR (nhung lang)) ((luong toan) OR (truong toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh trinh va ((nhung nang) or (nhung lang)) ((luong toan) OR (truong toan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh trinh va ((nhung nang) or (nhung lang)) ((luong toan) OR (truong toan)) cau*.