Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
phan xuong » phan cong
hoc thieu » toc thieu, hoc hien
manh dung » manh hung, manh tung, anh dung
dung phan » dung nhan, dung luan, dung ha
dung toan » dung doanh, dung thang, dung thanh
dung dan » dung dat, dung san, tung dan
phan lap » phan dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu hach - manh dung phan xuong ((dung toan) or (dung dan)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - manh dung phan xuong ((dung toan) OR (dung dan)) phan lap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - manh dung phan xuong ((dung toan) or (dung dan)) phan lap*.