Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
va thanh » gia thanh, ban thanh, va tinh
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va danh, ban hanh
nang co » nang cao, nang doc, nang noi
tu sach » thu sach, su sach, te sach
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang co hoc. hieu ((ve cham) or (vu cham)) luc ((va hanh) OR (va thanh)) va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang co hoc. hieu ((ve cham) OR (vu cham)) luc ((va hanh) OR (va thanh)) va dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang co hoc. hieu ((ve cham) or (vu cham)) luc ((va hanh) OR (va thanh)) va dau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang co hoc. hieu ((ve cham) or (vu cham)) luc ((va hanh) OR (va thanh)) va dau tren*.