Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
dinh kien » linh kien, dinh dien, dinh ket
danh viet » anh viet, ninh viet, nang viet
doc sach » hoc sach, toc sach, nuoc sach
qua tham » qua cham, qua than, qua thanh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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: doc sach ky nang xa hoi. hieu qua tham thuc vat ((dinh kien) or (danh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu qua tham thuc vat ((dinh kien) OR (danh viet)) cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu qua tham thuc vat ((dinh kien) or (danh viet)) cua tre*.