Perhaps you should try some spelling variations:
huong doi » huong dan, trong doi, dung doi
va huong » va thuong, va phuong, va tuong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang xa » lang xa, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang xa) or (nang x)) hoi. ((hieu va) OR (lieu va)) cam tuc va huong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang x)) hoi. ((hieu va) OR (lieu va)) cam tuc va huong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) or (nang x)) hoi. ((hieu va) OR (lieu va)) cam tuc va huong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) or (nang x)) hoi. ((hieu va) OR (lieu va)) cam tuc va huong doi cua tre*.