Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong thao » phuong phap, phuong thuc
trung vap » trung cap, trung va, trung van
thanh cau » thanh chau, thanh mau, nhanh cau
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
vap bang » lap bang, va bang, cap bang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - thanh trung vap bang ((phuong tay) or (phuong thao)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - thanh trung vap bang ((phuong tay) OR (phuong thao)) thanh cau.
• Adding a wildcard symbol may retrieve word variants: theo chu sach - thanh trung vap bang ((phuong tay) or (phuong thao)) thanh cau*.