Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
hoc van » hoc dan, hoc va, hoc vat
va chat » van chat, va phat, cao chat
sach ty » sach y, sach tu, sach thu
va cham » va tham
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang

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 ty nang ma hoa. hieu ((va cham) or (va chat)) hoc van hanh ((vai cua) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoa. hieu ((va cham) OR (va chat)) hoc van hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoa. hieu ((va cham) or (va chat)) hoc van hanh ((vai cua) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoa. hieu ((va cham) or (va chat)) hoc van hanh ((vai cua) OR (hai cua)) tre*.