Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat huu » pham huu
van dinh » van minh, van dich, xuan dinh
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
va dinh » va kinh, va tinh, vu dinh
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: thuat sach ky ((nang xa) or (nang x)) hoi. hieu van chat huu ((va dinh) OR (van dinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang x)) hoi. hieu van chat huu ((va dinh) OR (van dinh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (nang x)) hoi. hieu van chat huu ((va dinh) OR (van dinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (nang x)) hoi. hieu van chat huu ((va dinh) OR (van dinh)) dai cua tre*.