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