Perhaps you should try some spelling variations:
dao nguoi » cho nguoi
hanh duoc » hanh thuoc, nganh duoc, doanh duoc
hach hoc » cach hoc, mach hoc, hoach hoi
ly nguoi » le nguoi, tay nguoi, lam nguoi
tu hach » tu cach, tu sach, vu khach
hoc dao » hoc dan, hoc cao, hoc dai
tu hanh » du hanh, lu hanh, thuc hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hach hoc dao nguoi ) or ( tu hanh duoc ly nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hach hoc dao nguoi ) OR ( tu hanh duoc ly nguoi )).
• Adding a wildcard symbol may retrieve word variants: (( tu hach hoc dao nguoi ) or ( tu hanh duoc ly nguoi ))*.