Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thu sach » thuat sach, thuoc sach, thu hoach
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » su sach, te sach, tu cach
hanh ve » hanh vi, hanh va, hanh kem
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
ve cua » le cua, de cua, te cua
cua te » cua tu
y nang » ky nang, ly nang, v nang

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