Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, nhan sinh
hanh trinh » canh tranh, hanh chinh
hien sach » dien sach, kien sach, thien hach
thanh cau » thanh chau, thanh mau, nhanh cau
cua dung » cua dang, cua dong, qua dung
cong son » cong so, dong son, cong lon
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - ((nhanh tinh) OR (hanh trinh)) cua dung ((cong son) or (cong san)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - ((nhanh tinh) OR (hanh trinh)) cua dung ((cong son) OR (cong san)) thanh cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - ((nhanh tinh) OR (hanh trinh)) cua dung ((cong son) or (cong san)) thanh cau*".