Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
thanh pha » thanh phan, thanh pham, thanh pho
trinh va » trinh van, trinh vat, trinh ve
pha cau » phan cau, phap cau, pha cac
ung » cung
dung » dcung

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 nhanh) OR (tien thanh)) - canh trinh va ((ung dung) or (thong cong)) thanh pha cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - canh trinh va ((ung dung) OR (thong cong)) thanh pha cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) OR (tien thanh)) - canh trinh va ((ung dung) or (thong cong)) thanh pha cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) OR (tien thanh)) - canh trinh va ((ung dung) or (thong cong)) thanh pha cau*.