Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va sach » van sach, va cach, a sach
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang doc, nang noi
nang ho » nang hoc, tang ho, nang cao
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: tu sach ty ((nang ho) OR (nang co)) hoi. hieu va sach nuoc va hanh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ho) OR (nang co)) hoi. hieu va sach nuoc va hanh lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang ho) OR (nang co)) hoi. hieu va sach nuoc va hanh lai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ho) OR (nang co)) hoi. hieu va sach nuoc va hanh lai ((cua tre) or (cuu tre))*.