Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
tu cach » tu cac
hoa hoi » khoa hoi, hoa hoc, hoa doi
vai cua » dai cua, hai cua, lai cua
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
ha hoi » ha noi, xa hoi, va hoi
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thuat sach)) ky lang ((ha hoi) OR (hoa hoi)). hieu ve cao duc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuat sach)) ky lang ((ha hoi) OR (hoa hoi)). hieu ve cao duc va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuat sach)) ky lang ((ha hoi) OR (hoa hoi)). hieu ve cao duc va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuat sach)) ky lang ((ha hoi) OR (hoa hoi)). hieu ve cao duc va thanh vai cua tre*.