Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
trinh tai » trinh toan, trinh han, chinh tai
hang cong » dang cong, hang nong, bang cong
trinh tu » trinh ky, trinh do
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 thuat) or (((trinh tu) or (trinh tai)))) hang cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh ((trinh thuat) OR (((trinh tu) OR (trinh tai)))) hang cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh ((trinh thuat) or (((trinh tu) or (trinh tai)))) hang cong dan van ban*.