Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
manh trung » manh tung, thanh trung, manh hung
trung phan » trung thanh, trung ha, dung phan
phan xuong » phan cong
hoc thieu » toc thieu, hoc hien
dung toan » dung doanh, dung thang, dung thanh
dung dat » dung va, dung tai
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 thieu hach - manh trung phan xuong ((dung toan) or (dung dat)) phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - manh trung phan xuong ((dung toan) OR (dung dat)) phan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - manh trung phan xuong ((dung toan) or (dung dat)) phan tap*.