Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu hach » thien hach, chieu sach, hieu cach
trung quan » truong quan, trong quan, trung tuan
thong cong » tong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca 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 trung quan ((thong cong) or (trong cong)) dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh trung quan ((thong cong) OR (trong cong)) dan can cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - thanh trung quan ((thong cong) or (trong cong)) dan can cau*.