Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thu sach » thuat sach, thuoc sach, thu hoach
vu cham » va cham, vu kham, tu cham
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » su sach, te sach, tu cach
ve cham » va cham, ve chat, ve chim
nang co » nang cao, nang doc, nang noi
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
va dau » va dao

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: ((tu sach) OR (thu sach)) y nang co hoc. hieu ((ve cham) OR (vu cham)) luc va hanh va dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang co hoc. hieu ((ve cham) or (vu cham)) luc va hanh va dau tren~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang co hoc. hieu ((ve cham) or (vu cham)) luc va hanh va dau tren*.