Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
cong sat » cong suat, cong hat, cong nhat
cong san » cong tac
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 - canh tranh cua trong ((cong sat) or (cong san)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - canh tranh cua trong ((cong sat) OR (cong san)) phan lap*.