Perhaps you should try some spelling variations:
dinh hai » dinh thai, tinh hai, dinh ha
cham luc » nhan luc, cham cuu, chat lua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
va dinh » van dinh, va kinh, va tinh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang ma) or (nang cao)) hoi. hieu va ((cham luc) OR (cham soc)) va dinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (nang cao)) hoi. hieu va ((cham luc) OR (cham soc)) va dinh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) or (nang cao)) hoi. hieu va ((cham luc) OR (cham soc)) va dinh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) or (nang cao)) hoi. hieu va ((cham luc) OR (cham soc)) va dinh hai cua tre*.