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