Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
thong nhung » trong nhung, thong thuong, thong thong
thiet danh » thien danh, thien anh, thien dang
hanh trinh » canh tranh, hanh chinh
cong ngang » cong nhan, cong quang, cong lang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong vang » cong lang, cong quang, cong san
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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

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