Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thanh toan » thanh hoa, thanh san
kham sach » pham sach, khau sach, nam sach
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua thong » cua thuong, cua khong, cua tong
ham sach » pham sach, nam sach, lam sach
tinh cua » trinh cua, sinh cua, tinh chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao ((kham sach) or (ham sach)) - hanh tinh cua thong cong ((tinh toan) or (thanh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao ((kham sach) OR (ham sach)) - hanh tinh cua thong cong ((tinh toan) OR (thanh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: chao ((kham sach) or (ham sach)) - hanh tinh cua thong cong ((tinh toan) or (thanh toan)) cao*.