Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, lieu tinh
thien tinh » khien tinh, thien minh, tien tinh
canh trinh » canh tranh, hanh trinh, canh tinh
mang thong » mang trong, hang thuong, dang thuong
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
mat thong » suat thong, xuat thong, va thong
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 ((thieu tinh) OR (thien tinh)) - canh trinh ((mat thong) or (mang thong)) cong thanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tinh) OR (thien tinh)) - canh trinh ((mat thong) OR (mang thong)) cong thanh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu tinh) OR (thien tinh)) - canh trinh ((mat thong) or (mang thong)) cong thanh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tinh) OR (thien tinh)) - canh trinh ((mat thong) or (mang thong)) cong thanh toan cau*.