Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
nang cau » nang cao, hang cau, nang dau
cam cuc » cam xuc, cham cuu, pham cuc
cua tre » cua te, cua triet, dua tren
cuc ban » cua ban, cac ban, cuu ban
cuu tre » cau tren, cau treo
sach ty » sach y, sach thu, xach tay
hieu ve » hieu va, hieu van
cau hoa » cau hoi
sach tu » sach thu, cach tu, sach uu
ve cam » ve cham, ve cac, va cam

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 tu)) nang cau hoa. hieu ve cam cuc ban thanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang cau hoa. hieu ve cam cuc ban thanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang cau hoa. hieu ve cam cuc ban thanh tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) nang cau hoa. hieu ve cam cuc ban thanh tai ((cua tre) or (cuu tre))*.