Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
ctinh cua » chinh cua, sinh cua, trinh cua
doc hieu » toc thieu, hoc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan

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: doc hieu xanh - hanh ((ctinh cua) OR (tinh cua)) thong cong ((dan toan) OR (van tuan)) cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((ctinh cua) or (tinh cua)) thong cong ((dan toan) or (van tuan)) cau*.