Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
thieu tinh » trieu tinh, chieu tinh, thien tinh
canh trinh » canh tranh, hanh trinh, canh tinh
chuan bang » chua bang, chuan trang, can bang
hoc thieu » toc thieu, hoc hien
duong van » duong va, luong va, dang van
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 - canh trinh chuan bang ((hang va) or (duong van)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - canh trinh chuan bang ((hang va) OR (duong van)) ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh trinh chuan bang ((hang va) or (duong van)) ((toan cau) or (toan ban))*.