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