Perhaps you should try some spelling variations:
thien van » thi van
kinh moi » dinh moi, kinh mon, kinh hoc
sinh moi » dinh moi, sinh khoi, sinh hoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x ho. thien van cam ((luc va) or (duc va)) ((kinh moi) OR (sinh moi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x ho. thien van cam ((luc va) OR (duc va)) ((kinh moi) OR (sinh moi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x ho. thien van cam ((luc va) or (duc va)) ((kinh moi) OR (sinh moi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. thien van cam ((luc va) or (duc va)) ((kinh moi) OR (sinh moi)) cua tre*.