Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong dan » phuong danh, phuong doan, huong dan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh hang » thanh hang, hang hang, hanh han
ho chiet » ho chieu, ho thiet, hoa thiet
toan cau » toan cao, toan ban, toan tap
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: ((ho chiet) OR (hoc thiet)) tach - hanh hang va nhung phuong dan ((toan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (hoc thiet)) tach - hanh hang va nhung phuong dan ((toan cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) OR (hoc thiet)) tach - hanh hang va nhung phuong dan ((toan cau) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) OR (hoc thiet)) tach - hanh hang va nhung phuong dan ((toan cau) or (phan cau))*.