Perhaps you should try some spelling variations:
dau tren » dau tien, dau tieng, dau trong
dat tren » dat trong, dua tren
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach ty)) nang co hoc. hieu ve cac xuc va hanh ve ((dau tren) OR (dat tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) OR (sach ty)) nang co hoc. hieu ve cac xuc va hanh ve ((dau tren) or (dat tren))~".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) OR (sach ty)) nang co hoc. hieu ve cac xuc va hanh ve ((dau tren) or (dat tren))*.