Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cau thuc » cau truc, cuu thuc, can thuc
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va, hanh kem
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 hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ((y lang) OR (_ lang)) xa hoi. hieu va cau thuc dan hanh 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 hanh ve cua te*.