Perhaps you should try some spelling variations:
thien van » thi van
doc sach » hoc sach, toc sach, nuoc sach
van pham » san pham, van phan, van phat
dinh dai » dinh dat, sinh dai, dinh dao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
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: doc sach ky nang xa hoi. thien van pham ((thuc va) OR (thuc vat)) dinh dai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. thien van pham ((thuc va) OR (thuc vat)) dinh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. thien van pham ((thuc va) OR (thuc vat)) dinh dai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. thien van pham ((thuc va) OR (thuc vat)) dinh dai ((cua tre) or (cuu tre))*.