Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
ve ban » va ban, ve bao, vu ban
vi cau » va cau, ve cau, di cau
te ban » te bao
bo va » bao va, do va, co va
so va » so van, so vat, su va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x hoi. hieu ((ve ban) OR (te ban)) ((bo va) or (so va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ((ve ban) OR (te ban)) ((bo va) OR (so va)) hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu ((ve ban) OR (te ban)) ((bo va) or (so va)) hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ((ve ban) OR (te ban)) ((bo va) or (so va)) hanh vi cau tren*.