Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cac nuoc » cap nuoc, hoc nuoc, cua nuoc
nang thi » dang thi, tang thi, nang tai
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
thi van » thi lan, thi hanh, thi nang
va nang » van nang, da nang, cam nang
thi cua » thai cua, thi cuc, tri cua
cua tre » cua te, cuu tre, cua triet
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 ty nang x hoi. thi van ((cac nuoc) or (dat nuoc)) va nang thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang x hoi. thi van ((cac nuoc) OR (dat nuoc)) va nang thi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang x hoi. thi van ((cac nuoc) or (dat nuoc)) va nang thi cua tre*.