Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
danh vai » danh sai, danh va, doanh van
sach thu » sach thue, sach thieu, sach tham
luc nuoc » lua nuoc, luan nuoc, duoc nuoc
hieu luc » hieu luat, hieu qua
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
nang xa » lang xa, nang ma, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach thu)) ((nang xa) or (nang x)) hoi. hieu hieu luc nuoc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) ((nang xa) OR (nang x)) hoi. hieu hieu luc nuoc va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) ((nang xa) or (nang x)) hoi. hieu hieu luc nuoc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) ((nang xa) or (nang x)) hoi. hieu hieu luc nuoc va danh vai cua tre*.