Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
anh thai » anh thi, anh tai, nhanh thai
thai cuu » thai cua, tai cuc, thi cuc
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
o ha » y ha, _ ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((o ha) or (o hai)). hieu ve cac vuc van anh thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((o ha) OR (o hai)). hieu ve cac vuc van anh thai cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((o ha) or (o hai)). hieu ve cac vuc van anh thai cuu tre*.