Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhan xuong » phan xuong, nhan tuong, khac xuong
dung thang » hung thang, cung thang, dung thuong
hoc thien » hoc hien, hoc thieu, hoc thiet
manh dung » manh hung, manh tung, anh dung
dung nhan » dung luan
dang toan » dang tran, dan toan, dung toan
phan tap » phan lap, han tap, pha tap

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 - manh dung nhan xuong ((dang toan) or (dung thang)) phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - manh dung nhan xuong ((dang toan) OR (dung thang)) phan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - manh dung nhan xuong ((dang toan) or (dung thang)) phan tap*.