Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
cau tren » cu tren, dau tren, ca tren
cham duc » pham duc, cham soc, pham duy
tai khoa » da khoa, noi khoa
lang tai » lang thai, hang tai, tang tai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hanh va » hang va, hanh vi
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang tai khoa. hieu ve cham duc va ((thanh van) OR (hanh va)) ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang tai khoa. hieu ve cham duc va ((thanh van) or (hanh va)) ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang tai khoa. hieu ve cham duc va ((thanh van) or (hanh va)) ((cuu tre) OR (cau tren))*.