Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
cam loc » cam lo
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky sang » ky dang, ky tang, duy sang
loc va » hoc va, luc va
ve cam » ve cham, ve cac, va cam

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 sang) or (ky nang)) mai khoi. hieu ve cam loc va ((hanh vai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky nang)) mai khoi. hieu ve cam loc va ((hanh vai) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky nang)) mai khoi. hieu ve cam loc va ((hanh vai) or (hanh vi)) cua tre*.