Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
nhung don » nhung van, nhung bo
trinh cai » trinh tai, trinh cau, trinh cac
tinh cao » tinh lao, tinh chat, tinh cach

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 sach - canh tranh cua ((nhung don) OR (thong cong)) ((tinh cao) OR (trinh cai)) tu~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh tranh cua ((nhung don) or (thong cong)) ((tinh cao) or (trinh cai)) tu*.