Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
dau tren » dau tien, dau tieng, dau trong
dat tren » dat trong, dua tren
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
co hoi » co hoc, co loi
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc 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) OR (nuoc sach)) y nang co hoi. hieu ve cac luc va hanh va ((dau tren) OR (dat tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (nuoc sach)) y nang co hoi. hieu ve cac luc va hanh va ((dau tren) or (dat tren))~".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (nuoc sach)) y nang co hoi. hieu ve cac luc va hanh va ((dau tren) or (dat tren))*.