Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
thiet dung » thuyet dung, nhiet dong, viet dung
dung cong » dung trong
khi sinh » ki sinh, thi sinh, khoe sinh
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 khi sinh - hanh trinh thiet dung cong dan toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi sinh - hanh trinh thiet dung cong dan toan cau*.