Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
theo lich » thai lich, theo sach
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
tong cong » trong cong, cong cong, dang cong
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 ((theo lich) or (thien hach)) - hanh trinh cua ((dung cong) or (tong cong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo lich) OR (thien hach)) - hanh trinh cua ((dung cong) OR (tong cong)) dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((theo lich) or (thien hach)) - hanh trinh cua ((dung cong) or (tong cong)) dan van ban*.