Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
bo sach » co sach, hoc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca 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 (bo sach)) ky tang ma hoi. hieu va cam duc va hanh va cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (bo sach)) ky tang ma hoi. hieu va cam duc va hanh va cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (bo sach)) ky tang ma hoi. hieu va cam duc va hanh va cua vat*.