Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
hoan chinh » hanh chinh, hoa hinh
phuong dan » phuong danh, phuong doan, huong dan
hoc chinh » hoc sinh, hoc kinh
trinh cua » tinh cua, trinh quan, trinh luan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chinh) or (hoan chinh)) sach - hanh ((trinh cua) OR (trinh luat)) nhung phuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoan chinh)) sach - hanh ((trinh cua) OR (trinh luat)) nhung phuong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) or (hoan chinh)) sach - hanh ((trinh cua) OR (trinh luat)) nhung phuong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) or (hoan chinh)) sach - hanh ((trinh cua) OR (trinh luat)) nhung phuong dan toan cao*.