Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
dang hoa » dang hoai, dang khoa, dong hoa
hoa hoi » khoa hoi, hoa hoc, hoa doi
qua cam » qua cham, qua cac, qua ca
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
ky dang » ky nang, ky danh
vai cua » dai cua, hai cua, lai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang hoa hoi. hieu qua cam xuc ((ban hanh) or (va danh)) ((vai cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang hoa hoi. hieu qua cam xuc ((ban hanh) OR (va danh)) ((vai cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang hoa hoi. hieu qua cam xuc ((ban hanh) or (va danh)) ((vai cua) or (di cua)) tre*.