Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
danh gia » dan gian
hieu van » hieu va, thien van, lieu va
thu hien » thuc hien, thi hien, thua thien
dang xay » dang van, van xay
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
su tien » su kien, su hien, tu tieng
van cam » van nam, van lam, van cau
xuc va » duc va, tuc va, luc va

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 ty ((nang x) or (dang xay)) hoi. hieu van cam xuc va danh gia ((su tien) or (thu hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ty ((nang x) OR (dang xay)) hoi. hieu van cam xuc va danh gia ((su tien) OR (thu hien)).
• Adding a wildcard symbol may retrieve word variants: doc sach ty ((nang x) or (dang xay)) hoi. hieu van cam xuc va danh gia ((su tien) or (thu hien))*.