Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
hanh ve » hanh vi, hanh va, hanh kem
nang ma » tang ma, sang ma, nang cao
hieu va » hieu qua
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 y ((nang xa) OR (nang ma)) 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 y ((nang xa) OR (nang ma)) 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 y ((nang xa) OR (nang ma)) hoi. ((hieu va) or (lieu va)) cau thuc dan hanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (nang ma)) hoi. ((hieu va) or (lieu va)) cau thuc dan hanh ve cua te*.