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
dung huong » dung thuong, dung phuong, dong huong
hoc thieu » hoc hien
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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 huong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) quang - hanh trinh thuat dung huong dan phan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) quang - hanh trinh thuat dung huong dan phan cau*.