Perhaps you should try some spelling variations:
ban hanh » ban hang
tang mai » tang ma, tang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
cham duc » pham duc, cham soc, pham duy
vu sach » vu bach, su sach, vu khach
cua tre » cuu tre, cua triet, dua tren
va danh » va dinh, va dan, va hanh
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
ty tang » tay tang, ty xang, ty hang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty tang mai khoi. hieu va cham duc ((ban hanh) or (va danh)) lam ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty tang mai khoi. hieu va cham duc ((ban hanh) OR (va danh)) lam ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty tang mai khoi. hieu va cham duc ((ban hanh) or (va danh)) lam ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty tang mai khoi. hieu va cham duc ((ban hanh) or (va danh)) lam ((cua tre) OR (cua te))*.