Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nang hoa » nang hoat, hang hoa, nang hoc
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, dao hanh
va danh » va dinh, va dan, dia danh
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

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