Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
sang tao » hang tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
va hanh » va thanh, va danh, ban hanh
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tao hoi » tao khoi, tao boi, tay hoi
ty sang » ty xang, ty hang, duy sang
cuu tre » cau tren, cau treo

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

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