Perhaps you should try some spelling variations:
thien van » thi van
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
dinh dai » dinh dat, sinh dai, dinh dao
dua tren » dung tren
van tham » van thanh, van tuan, van chat
cua tre » cua te, cua triet, cua thep
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thien van tham thuc va dinh dai ((((cua tre) or (dua tren))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien van tham thuc va dinh dai ((((cua tre) OR (dua tren))) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van tham thuc va dinh dai ((((cua tre) or (dua tren))) or (cuu tre))*.