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
sang ma » tang ma, sang tao, mang may
truc va » thuc va, trung va
nang ma » tang ma, nang cao, mang may
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 y ((nang ma) or (sang 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 y ((nang ma) OR (sang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) danh de cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((nang ma) or (sang ma)) hoi. hieu van chat ((truc va) or (thuc vat)) danh de cua tre*.