Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
trinh thuat » trinh luat, trinh thiet, trinh thuc
thieu tach » chiet tach, chieu sach, hieu cach
thien hach » thien thanh, hien hanh
trinh tai » trinh toan, trinh tu, trinh han
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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 tach) OR (thien hach)) - hanh ((trinh thuat) or (trinh tai)) nhung huong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien hach)) - hanh ((trinh thuat) OR (trinh tai)) nhung huong dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tach) OR (thien hach)) - hanh ((trinh thuat) or (trinh tai)) nhung huong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) OR (thien hach)) - hanh ((trinh thuat) or (trinh tai)) nhung huong dan toan tap*.