Perhaps you should try some spelling variations:
hoc chieu » hoc thieu, ho chieu, hoc dieu
hanh manh » hanh mang, hoang manh, thanh minh
lanh manh » lanh tranh, lan anh, van manh
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang 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 chieu) or (hoc hien)) tinh - ((hanh manh) OR (lanh manh)) cua dung cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) tinh - ((hanh manh) OR (lanh manh)) cua dung cong tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) tinh - ((hanh manh) OR (lanh manh)) cua dung cong tan van ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) tinh - ((hanh manh) OR (lanh manh)) cua dung cong tan van ban*.