Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
thi hanh » thi thanh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc van » nuoc va, nuoc san, luoc van
van dang » van dong, van dung, van nang
dang hai » dang khai, hang hai, dung hai
thi van » thi lan, thi nang
hai cua » thai cua, dai cua, hoi cua
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 sac ky nang x hoi. ((thi van) or (thi hanh)) cac nuoc van dang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang x hoi. ((thi van) OR (thi hanh)) cac nuoc van dang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang x hoi. ((thi van) or (thi hanh)) cac nuoc van dang hai cua tre*.