Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tinh » thanh binh, nhanh tinh, than kinh
nhung cong » dung cong, thong cong, hang cong
cong manh » cong danh, duong manh, cong thanh
toan ban » van ban
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (chieu xanh)) - thanh tinh va nhung cong manh ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (chieu xanh)) - thanh tinh va nhung cong manh ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) or (chieu xanh)) - thanh tinh va nhung cong manh ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (chieu xanh)) - thanh tinh va nhung cong manh ((toan tap) OR (toan ban))*.