Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
cau thuc » cuu thuc, can thuc, cau phuc
lang van » dang van, tang van, hoang van
hanh ve » hanh vi, hanh va, hanh kem
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay
sach o » sach lo, sac o, sach y
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 o ((lang xa) or (lang van)) hoi. hieu qua ((cau thuc) OR (cau truc)) dan hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o ((lang xa) OR (lang van)) hoi. hieu qua ((cau thuc) OR (cau truc)) dan hanh ve cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach o ((lang xa) or (lang van)) hoi. hieu qua ((cau thuc) OR (cau truc)) dan hanh ve cua te*".