Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
kieu tinh » lieu tinh, trieu tinh, diep tinh
chau tinh » cuu tinh, ha tinh, cua tinh
hieu quan » hieu qua, lieu quan, thien quan
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua trong » cua truong, cua trung, qua trong
tinh cua » trinh cua, sinh cua, tinh chat
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((kieu tinh) OR (chau tinh))) OR (hieu quan)) - hanh tinh cua trong cong trinh toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((((kieu tinh) or (chau tinh))) or (hieu quan)) - hanh tinh cua trong cong trinh toan cau*.