Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
tinh dai » trinh dai, tinh da, tinh hai
cham tuc » nham thuc, pham thuc, tham thuc
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
nang xa » nang x, lang xa, mang xa
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: hoc sach y ((nang xa) or (nang ma)) hoi. thien van ((cham tuc) or (nhan thuc)) va tinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((nang xa) OR (nang ma)) hoi. thien van ((cham tuc) OR (nhan thuc)) va tinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((nang xa) or (nang ma)) hoi. thien van ((cham tuc) or (nhan thuc)) va tinh dai cua tre*.