Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
dinh dao » dinh dat, minh dao, dinh cao
dinh dai » dinh dat, sinh dai, dinh tai
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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 ky ((nang xa) or (lang xa)) hoi. hieu van chat xuc va ((dinh dai) OR (dinh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (lang xa)) hoi. hieu van chat xuc va ((dinh dai) OR (dinh dao)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (lang xa)) hoi. hieu van chat xuc va ((dinh dai) OR (dinh dao)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (lang xa)) hoi. hieu van chat xuc va ((dinh dai) OR (dinh dao)) cua tre*.