Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
phan cong » thanh cong
toan lap » toan tap, toan lao, thanh lap
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 - hanh dung ((phan xuong) or (phan cong)) cong thanh ((toan lap) or (phan lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - hanh dung ((phan xuong) OR (phan cong)) cong thanh ((toan lap) OR (phan lap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - hanh dung ((phan xuong) or (phan cong)) cong thanh ((toan lap) or (phan lap))*.