Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
qua cac » cua cac
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
te sach » toc sach
ca cua » co 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 (te sach)) ky ((nang xa) or (tang ma)) hoi. hieu qua cac duc va hanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky ((nang xa) OR (tang ma)) hoi. hieu qua cac duc va hanh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky ((nang xa) or (tang ma)) hoi. hieu qua cac duc va hanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky ((nang xa) or (tang ma)) hoi. hieu qua cac duc va hanh ca cua te*.