Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
tinh cua » trinh cua, tinh chat, tranh cua
sinh cua » manh cua, dinh cuu, sinh va
cong van » cong vang, cong san, song van
ban cau » bang cau, ban can, van cau

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: ho ((hieu manh) OR (hieu lang)) - hanh ((tinh cua) OR (sinh cua)) thong cong van ban cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (hieu lang)) - hanh ((tinh cua) OR (sinh cua)) thong cong van ban cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (hieu lang)) - hanh ((tinh cua) OR (sinh cua)) thong cong van ban cau*.