Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thiet tach » chiet tach, thien hach, thuat tach
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang cua » tranh cua, tang cua, trung cua
tan tap » toan tap, han tap, man tap
tan tat » ban tat, toan tap, toan tai

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 tach - hanh trang cua ((nhung cong) or (nhung phuong)) van ((tan tap) OR (tan tat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trang cua ((nhung cong) OR (nhung phuong)) van ((tan tap) OR (tan tat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh trang cua ((nhung cong) or (nhung phuong)) van ((tan tap) OR (tan tat))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trang cua ((nhung cong) or (nhung phuong)) van ((tan tap) OR (tan tat))*.