Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
khong cong » khong cang, chong cong, khong con
trinh toan » tinh toan, thanh toan, trinh quan
tieu sach » chieu sach, dien sach, te sach
trinh han » trinh quan
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan

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 sach - anh tang cua ((khong cong) OR (thong cong)) ((trinh toan) or (trinh han)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh tang cua ((khong cong) OR (thong cong)) ((trinh toan) OR (trinh han)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh tang cua ((khong cong) OR (thong cong)) ((trinh toan) or (trinh han)) cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang cua ((khong cong) OR (thong cong)) ((trinh toan) or (trinh han)) cau*.