Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
hanh trinh » canh tranh, hanh chinh
thuat dung » thuat hung, thuat ung, thuat xung
hoc thieu » hoc hien
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) quang - hanh trinh thuat dung cong dan ((phan cau) OR (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) quang - hanh trinh thuat dung cong dan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) quang - hanh trinh thuat dung cong dan ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) quang - hanh trinh thuat dung cong dan ((phan cau) OR (phan tu))*.