Perhaps you should try some spelling variations:
sang tao » hang tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, tay hoi
hieu va » lieu va, hieu qua
hoc can » hoc dan, hoc cao, hoc cac
vi cua » vai 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: te sach ky sang tao hoi. hieu va cac ((duc tan) or (hoc can)) hanh ((vi cua) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang tao hoi. hieu va cac ((duc tan) OR (hoc can)) hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang tao hoi. hieu va cac ((duc tan) or (hoc can)) hanh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tao hoi. hieu va cac ((duc tan) or (hoc can)) hanh ((vi cua) OR (di cua)) tre*.