Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
lang van » dang van, tang van, hoang van
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
hieu va » lieu va, hieu qua
te sach » toc sach
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
soc va » loc va, doc va, goc 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 ty ((lang xa) or (lang van)) hoi. hieu va cham ((soc va) OR (hoc va)) nang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (lang van)) hoi. hieu va cham ((soc va) OR (hoc va)) nang dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((lang xa) or (lang van)) hoi. hieu va cham ((soc va) OR (hoc va)) nang dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (lang van)) hoi. hieu va cham ((soc va) OR (hoc va)) nang dai cua tre*.