Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
vang thanh » van thanh, dang thanh, tang thanh
tieu sach » chieu sach, dien sach, te sach
trung cao » truong cao, trung cap, trung ca
cong vang » cong lang, cong quang, cong ngang
thanh cau » thanh chau, thanh mau, nhanh cau
trung co » trung bo, trong co, truong cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh ((trung cao) or (trung co)) thong cong vang thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh ((trung cao) OR (trung co)) thong cong vang thanh cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh ((trung cao) or (trung co)) thong cong vang thanh cau*.