Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doc sach » hoc sach, toc sach, nuoc sach
dan danh » van danh, ban danh, dai danh
han danh » van danh, phan dang, nhan dang
kien cua » khien cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
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 va tham thuc ((dan danh) OR (han danh)) kien cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. hieu va tham thuc ((dan danh) OR (han danh)) kien cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu va tham thuc ((dan danh) OR (han danh)) kien cua tre*.