Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
coc thuc » hoc thuc, doc thuc, co thuc
cau treo » cau tren, cau triet, cau trieu
thu sach » thuat sach, thuoc sach, thu hoach
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
v nang » va nang, vu nang, van nang
ve coc » ve cuoc, ve cac, ve co
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: ((tu sach) OR (thu sach)) v nang x hoi. hieu ve coc thuc va thanh vi ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang x hoi. hieu ve coc thuc va thanh vi ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) v nang x hoi. hieu ve coc thuc va thanh vi ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) v nang x hoi. hieu ve coc thuc va thanh vi ((cau treo) or (cau theo))*.