Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
dang thai » dang thi, dang hai, dang khai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
van cac » van hac, van cau, van bac
va dang » van dang, va nang, va lang
san ky » sang ky, van ky, dan ky
ma hoi » xa hoi, ma hoa, me hoi
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat san ky nang ((ma hoi) or (mai hoi)). hieu van cac nuoc va dang thai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ky nang ((ma hoi) OR (mai hoi)). hieu van cac nuoc va dang thai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thuat san ky nang ((ma hoi) or (mai hoi)). hieu van cac nuoc va dang thai ((cua te) or (cua tu))*.