Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
khong cong » khong cang, chong cong, khong con
mot chieu » doi chieu, ho chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
tac vang » cac van, tac dung, tac dong
vang cau » hang cau, van cau, bang cau
doi chi » doi khi

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: ((mot chieu) OR (doi chi)) sang - hanh tinh cua ((khong cong) OR (thong cong)) tac vang cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chi)) sang - hanh tinh cua ((khong cong) OR (thong cong)) tac vang cau~".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doi chi)) sang - hanh tinh cua ((khong cong) OR (thong cong)) tac vang cau*.