Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
tranh cua » doanh cua, manh cua
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
van van » van ban, san van, van vat
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 thien hach - canh tranh cua dung cong ((van van) or (tan van)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - canh tranh cua dung cong ((van van) OR (tan van)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - canh tranh cua dung cong ((van van) or (tan van)) cau*.