Perhaps you should try some spelling variations:
thay nuoc » tham nuoc, tray nuoc, thoat nuoc
sach thu » sach thue, sach thieu, sach tham
hanh lai » hanh lam, hanh tai, thanh lap
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va thay » va tham, la thay, va hay
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
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 ty) OR (sach thu)) nang cao hoi. hieu va thay nuoc va hanh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang cao hoi. hieu va thay nuoc va hanh lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) nang cao hoi. hieu va thay nuoc va hanh lai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach thu)) nang cao hoi. hieu va thay nuoc va hanh lai ((cua tre) or (cuu tre))*.