Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu tinh)) - hanh ((trinh cua) OR (tinh cua)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu tinh)) - hanh ((trinh cua) OR (tinh cua)) nhung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chieu tinh)) - hanh ((trinh cua) OR (tinh cua)) nhung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu tinh)) - hanh ((trinh cua) OR (tinh cua)) nhung cong dan toan cau*.