Perhaps you should try some spelling variations:
thieu cach » hieu cach, thieu cac, hieu cac
phung cong » nhung cong, phong cong, nhung chong
hoc thieu » toc thieu, hoc hien
canh tinh » hanh tinh, manh tinh, canh tranh
tinh luan » trinh luan, binh luan, minh luan
hung cong » nhung cong, hung cuong, dung cong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 cach - canh tinh luan ((hung cong) OR (phung cong)) dan than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu cach - canh tinh luan ((hung cong) OR (phung cong)) dan than tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu cach - canh tinh luan ((hung cong) OR (phung cong)) dan than tap*.