Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
truc va » thuc va, trung va
nang xa » nang x, lang xa, mang xa
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) danh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) danh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) danh de cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) danh de cua tre*.