Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
cua tren » dua tren, ca tren, cua truyen
te sach » toc sach
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
o hoa » do hoa, so hoa, o ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((o hoa) or (o hai)). hieu ve cac xuc van thanh thai ((cua tren) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hoa) OR (o hai)). hieu ve cac xuc van thanh thai ((cua tren) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hoa) or (o hai)). hieu ve cac xuc van thanh thai ((cua tren) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoa) or (o hai)). hieu ve cac xuc van thanh thai ((cua tren) OR (cua tre))*.