Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
thanh tung » thanh cong
thong cong » tong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
tung quan » tuong quan, trung quan, dung quan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 - thanh tung quan ((thong cong) or (trong cong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh tung quan ((thong cong) OR (trong cong)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - thanh tung quan ((thong cong) or (trong cong)) dan chan cau*.