Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
lang thai » lang chai, dang thai, lang hai
thi hanh » thi thanh
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi nang
va lang » va nang, hoa lang
cua tre » cua te, cuu tre, cua triet
5 hoi » o hoi

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 nang ((5 hoi) or (xa hoi)). ((thi van) OR (thi hanh)) bac nuoc va lang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((5 hoi) OR (xa hoi)). ((thi van) OR (thi hanh)) bac nuoc va lang thai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((5 hoi) or (xa hoi)). ((thi van) OR (thi hanh)) bac nuoc va lang thai cua tre*".