Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
nang co » nang cao, nang doc, nang noi
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
tu sach » su sach, te sach, tu cach
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
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: ((thu sach) OR (tu sach)) y nang co hoc. hieu ((ve cham) or (vu cham)) luc van hanh va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang co hoc. hieu ((ve cham) OR (vu cham)) luc van hanh va dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) y nang co hoc. hieu ((ve cham) or (vu cham)) luc van hanh va dau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) y nang co hoc. hieu ((ve cham) or (vu cham)) luc van hanh va dau tren*.