Perhaps you should try some spelling variations:
chat trong » nhat trong, thuat trong, chat luong
hoc khien » hoc hien, hoc nghien, hoc vien
hoc thieu » toc thieu, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong ban » cong bang, cong san, cong tan
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc khien) or (hoc thieu)) tinh - hanh tinh chat trong cong ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc khien) OR (hoc thieu)) tinh - hanh tinh chat trong cong ban khan cap*.