Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
chinh tai » chinh tri
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh vat

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

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