Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
trinh cua » tinh cua, trinh quan, trinh luan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
dan toan » van toan, dan than, manh toan
toan ban » van 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 thien hach - hanh ((trinh cua) or (trinh luat)) ((hang cong) OR (dang cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh ((trinh cua) OR (trinh luat)) ((hang cong) OR (dang cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh ((trinh cua) or (trinh luat)) ((hang cong) OR (dang cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((trinh cua) or (trinh luat)) ((hang cong) OR (dang cong)) dan toan ban*.