Perhaps you should try some spelling variations:
nang thai » nang tai, dang thai, nang hai
lang thai » lang chai, dang thai, lang hai
thu sach » tu sach, thuat sach, thuoc sach
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thi van » thi lan, thi hanh, thi nang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x ho. ((thien van) OR (thi van)) bac nuoc va ((nang thai) or (lang thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x ho. ((thien van) OR (thi van)) bac nuoc va ((nang thai) OR (lang thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x ho. ((thien van) OR (thi van)) bac nuoc va ((nang thai) or (lang thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x ho. ((thien van) OR (thi van)) bac nuoc va ((nang thai) or (lang thai)) cua tre*.