Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dinh tri » chinh tri
tri cuu » tri cua, tra cuu, trinh cuu
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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: thu sach ky ((nang x) or (nang ma)) hoi. hieu ve cam ((xuc va) or (tuc va)) dinh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang x) OR (nang ma)) hoi. hieu ve cam ((xuc va) OR (tuc va)) dinh tri cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang x) or (nang ma)) hoi. hieu ve cam ((xuc va) or (tuc va)) dinh tri cuu tre*.