Perhaps you should try some spelling variations:
tu cach » tu cac
tang ma » mang may, tang van
dinh ca » dinh cac, dinh cua, dinh cao
va dinh » van dinh, va kinh, va tinh
hieu va » hieu qua
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ca cua » co cua
do va » do van, so va

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 (te sach)) ky tang ma hoi. ((hieu va) or (lieu va)) cau do va dinh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky tang ma hoi. ((hieu va) OR (lieu va)) cau do va dinh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky tang ma hoi. ((hieu va) or (lieu va)) cau do va dinh ca cua tre*.