Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang x) OR (tang ma)) hoi. hieu ve cam ((tuc va) OR (duc va)) hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang x) OR (tang ma)) hoi. hieu ve cam ((tuc va) OR (duc va)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang x) OR (tang ma)) hoi. hieu ve cam ((tuc va) OR (duc va)) hanh vi cuu tre*.