Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cau » va cau, ve cau, viet cau
di cau » da cau, diem cau

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 co hoc. hieu ve cam ((xuc va) or (tuc va)) hanh ((vi cau) or (di cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang co hoc. hieu ve cam ((xuc va) OR (tuc va)) hanh ((vi cau) OR (di cau)) tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang co hoc. hieu ve cam ((xuc va) or (tuc va)) hanh ((vi cau) or (di cau)) tren*.