Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac nuoc
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
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 y ((mang xa) or (nang ma)) hoi. hieu va ((cac duc) or (cac dac)) va hanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang xa) OR (nang ma)) hoi. hieu va ((cac duc) OR (cac dac)) va hanh ca cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang xa) or (nang ma)) hoi. hieu va ((cac duc) or (cac dac)) va hanh ca cua te*.