Perhaps you should try some spelling variations:
te sach » toc sach
su sach » so sach, vu 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
ca viet » va viet, co viet, hoa viet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (su sach)) ky tang ma hoa. hieu va cam duc va hanh vi ((ca viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky tang ma hoa. hieu va cam duc va hanh vi ((ca viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky tang ma hoa. hieu va cam duc va hanh vi ((ca viet) or (cua vat))*.