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
hanh te » hanh tu, hanh ve, hanh de
y nang » ly nang, v nang, may nang
va cau » van cau, va cac, va dau
te cua » tue cua, le cua, de 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 nang) or (ky nang)) xa hoi. hieu va cau thuc dan hanh te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((y nang) OR (ky nang)) xa hoi. hieu va cau thuc dan hanh te cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ((y nang) or (ky nang)) xa hoi. hieu va cau thuc dan hanh te cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ((y nang) or (ky nang)) xa hoi. hieu va cau thuc dan hanh te cua te*.