Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, thong thong, phong chong
tong cong » trong cong, cong cong, dung cong
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chiet tach) or (chieu sang)) - hanh trinh quan ((thong cong) OR (tong cong)) tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chiet tach) OR (chieu sang)) - hanh trinh quan ((thong cong) OR (tong cong)) tinh toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chiet tach) or (chieu sang)) - hanh trinh quan ((thong cong) OR (tong cong)) tinh toan tap*".