Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
lang thai » dang thai, lang hai, hoang thai
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
bac nuoc » cac nuoc, bach tuoc, sach nuoc
van bac » van ban, van bao, van hac
tu sach » su sach, te sach, tu cach
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: ((thu sach) or (tu sach)) ky nang x hoi. thien van bac nuoc va ((lang thai) OR (lang chai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang x hoi. thien van bac nuoc va ((lang thai) OR (lang chai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky nang x hoi. thien van bac nuoc va ((lang thai) OR (lang chai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang x hoi. thien van bac nuoc va ((lang thai) OR (lang chai)) cua tre*.