Perhaps you should try some spelling variations:
xuc tuan » duc thuan, quoc tuan, xuan tuan
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
anh thi » anh tho, dinh thi, dang thi
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
y nang » ky nang, ly nang, v nang
co hai » co dai, co hoi, o hai
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc

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 ((o hoc) or (co hai)). hieu ve cac xuc tuan anh thi ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoc) OR (co hai)). hieu ve cac xuc tuan anh thi ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((o hoc) or (co hai)). hieu ve cac xuc tuan anh thi ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoc) or (co hai)). hieu ve cac xuc tuan anh thi ((cuc tre) OR (duc tre))*.