Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
cao nuoc » cap nuoc, cac nuoc, cao ngoc
dong tri » dong tai, dung tri, dong thi
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va dong » van dong, ha dong, xa dong
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
va cao » va cac, va co, va dao
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 sac ky nang ((ma hoi) or (mai hoi)). hieu va cao nuoc va dong tri ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang ((ma hoi) OR (mai hoi)). hieu va cao nuoc va dong tri ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang ((ma hoi) or (mai hoi)). hieu va cao nuoc va dong tri ((cua te) or (cua tu))*.