Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
doi cua » dai cua, hoi cua
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, nam thuc, dam thuc
nang ma » tang ma, sang ma, mang may
cam tu » cam thu, nam tu, dam tu
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 cao) or (nang ma)) hoi. hieu qua ((cam tuc) or (cam tu)) van hanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang cao) OR (nang ma)) hoi. hieu qua ((cam tuc) OR (cam tu)) van hanh doi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang cao) or (nang ma)) hoi. hieu qua ((cam tuc) or (cam tu)) van hanh doi cua te*.