Perhaps you should try some spelling variations:
hien khanh » hien hanh, hien nhanh, dien khanh
tien thanh » tien thinh, tran thanh, den thanh
thong tai » truong tai, thong tin, hang tai
hanh han » hanh nhan, hanh phan, hanh san
cua tong » cua dong, cua nong, cua song
tai toan » bai toan, tap toan, tai tuan
toan cau » toan cao, toan ban, toan tap

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 khanh) or (tien thanh)) - hanh han ((cua tong) OR (cua cong)) thong tai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khanh) OR (tien thanh)) - hanh han ((cua tong) OR (cua cong)) thong tai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien khanh) or (tien thanh)) - hanh han ((cua tong) OR (cua cong)) thong tai toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien khanh) or (tien thanh)) - hanh han ((cua tong) OR (cua cong)) thong tai toan cau*.