Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trung » thanh trung, hanh trang, manh trung
thong cong » trong cong, tong cong, phong chong
trung cap » truong cao, trung tam
tac toan » tap toan, tam toan, hach toan
toan cau » 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: doi ((chiet tach) or (nhieu tang)) - hanh trung cap ((thong cong) OR (thong thong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (nhieu tang)) - hanh trung cap ((thong cong) OR (thong thong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chiet tach) or (nhieu tang)) - hanh trung cap ((thong cong) OR (thong thong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (nhieu tang)) - hanh trung cap ((thong cong) OR (thong thong)) tac toan cau*.