Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
dung cong » dung trong
hoc tieu » hoc thieu, hoc sieu, hoc tieng
hoc dieu » hoc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
tan cac » tai cac, tap cac, ton cac
cac cau » cac mau, bac 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 tieu) or (hoc dieu)) tinh - canh tranh va ((thong cong) or (dung cong)) tan cac cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc tieu) OR (hoc dieu)) tinh - canh tranh va ((thong cong) OR (dung cong)) tan cac cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc tieu) or (hoc dieu)) tinh - canh tranh va ((thong cong) or (dung cong)) tan cac cau*.