Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau treo » cau tren, cau triet, cau trieu
thuc day » thuc dan, thuc vat
cau theo » cau thi, cau tao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
dao vai » dao van, dao va, dao bai
ky lang » ky nang, ky dang, ky tang
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky lang xa hoi. hieu va nam ((thuc va) OR (thuc day)) dao vai ((cau treo) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky lang xa hoi. hieu va nam ((thuc va) OR (thuc day)) dao vai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky lang xa hoi. hieu va nam ((thuc va) OR (thuc day)) dao vai ((cau treo) or (cau theo))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky lang xa hoi. hieu va nam ((thuc va) OR (thuc day)) dao vai ((cau treo) or (cau theo))*.