Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
benh tai » benh dai, benh noi, hinh tai
tai cua » thai cua, tai cuc, tri cua
ba benh » va benh, bo benh, bach benh
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
ma hoi » mai hoi, xa hoi, me hoi
duc ba » duc ban, duc bao, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) OR (thuat san)) ky nang ((ma hoi) or (ma hoa)). lieu va cau duc ba benh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) ky nang ((ma hoi) OR (ma hoa)). lieu va cau duc ba benh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat san)) ky nang ((ma hoi) or (ma hoa)). lieu va cau duc ba benh tai cua tre*".