Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trinh » canh tranh, hanh chinh
trinh tuan » trinh quan, trinh toan, trinh luan
tuan nhung » quan nhung, tuan hung, thuat nhung
nhung cong » dung cong, thong cong, hang cong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) OR (chieu sach)) - hanh trinh tuan nhung cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - hanh trinh tuan nhung cong ((tac toan) OR (tam toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu sach)) - hanh trinh tuan nhung cong ((tac toan) or (tam toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu sach)) - hanh trinh tuan nhung cong ((tac toan) or (tam toan)) cao*.