Perhaps you should try some spelling variations:
thieu manh » hieu manh, tien manh, trieu minh
trung tuan » trung thanh, trung tam, tran tuan
truong cao » truong dai
hoc thieu » toc thieu, hoc hien
cong hach » cong thanh, cong khanh, trong hach
cong sach » ong sach, song sach, duong sach
toan ban » van ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu manh - manh ((trung tuan) OR (truong cao)) nhung ((cong hach) OR (cong sach)) toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu manh - manh ((trung tuan) or (truong cao)) nhung ((cong hach) OR (cong sach)) toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu manh - manh ((trung tuan) or (truong cao)) nhung ((cong hach) OR (cong sach)) toan ban*.