Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, dua ban, duc man
va cham » va chat, va tham
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
anh de » anh d, anh ve, anh du
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va cham ((duc ban) OR (duc van)) ((anh de) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu va cham ((duc ban) OR (duc van)) ((anh de) OR (hanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu va cham ((duc ban) OR (duc van)) ((anh de) or (hanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cham ((duc ban) OR (duc van)) ((anh de) or (hanh de)) cua tre*.