Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » te sach, tu cach, vu sach
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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) OR (thu sach))) or (su sach)) ky nang ma hoa. hieu va cam xuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (su sach)) ky nang ma hoa. hieu va cam xuc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (thu sach))) or (su sach)) ky nang ma hoa. hieu va cam xuc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (thu sach))) or (su sach)) ky nang ma hoa. hieu va cam xuc va hanh vi cua vat*.