Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
va cau » van cau, va cac, va dau
vi cua » vai cua, di 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 (thu sach)) ((y lang) or (_ lang)) xa hoi. hieu va cau thuc dan hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((y lang) OR (_ lang)) xa hoi. hieu va cau thuc dan hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ((y lang) or (_ lang)) xa hoi. hieu va cau thuc dan hanh vi cua te*.