Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach tu » sach thu, sach ty, sach uu
cach tu » cach thuc
hieu ve » hieu va, hieu van
chat vu » nhat vu, chat vo, chat huu
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho
hang » dang, bang, hanh

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 tu) or (cach tu)) nang x hoi. hieu ve ((chat vu) OR (chat va)) ngan hang va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) nang x hoi. hieu ve ((chat vu) OR (chat va)) ngan hang va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (cach tu)) nang x hoi. hieu ve ((chat vu) OR (chat va)) ngan hang va cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (cach tu)) nang x hoi. hieu ve ((chat vu) OR (chat va)) ngan hang va cau tren*.