Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dan khanh » dang khanh, van khanh, dat khanh
khanh ve » hanh ve, thanh ve, khanh v
thuc dan » thuc hanh, hoc dan, thuc vat
cau thuc » cau truc, cuu thuc, can thuc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
va cau » van cau, va cac, va dau
_ lang » o lang, _ land
y lang » o lang, tay lang, yen lang
ve cua » le cua, de cua, te cua
cua te » cua tu

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 (thuoc sach)) ((y lang) OR (_ lang)) xa hoi. hieu va cau thuc dan khanh ve cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thuoc sach)) ((y lang) OR (_ lang)) xa hoi. hieu va cau thuc dan khanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thuoc sach)) ((y lang) OR (_ lang)) xa hoi. hieu va cau thuc dan khanh ve cua te*.