Perhaps you should try some spelling variations:
dang than » dang thanh, sang than, dang tran
nang bach » nang sach, bang bac, nang ban
than cua » nhan cua, thai cua, ban cua
ki nang » ky nang
sach ky » sach y, sach ty, sach kem
tuoc va » thuoc va, duoc va, tuc va
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sac ky)) nang x hoi. ki nang bach ((tuoc va) or (nuoc va)) dang than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang x hoi. ki nang bach ((tuoc va) OR (nuoc va)) dang than cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sac ky)) nang x hoi. ki nang bach ((tuoc va) or (nuoc va)) dang than cua tre*.