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