Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
dieu cua » dieu tra
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va
va hang » van hang, va nang, va lang
di cua » dai cua, doi cua, de cua

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 ly hang xa hoi. ((hieu va) OR (hieu qua)) cham hoc va hang ((di cua) or (dieu cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly hang xa hoi. ((hieu va) OR (hieu qua)) cham hoc va hang ((di cua) OR (dieu cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly hang xa hoi. ((hieu va) OR (hieu qua)) cham hoc va hang ((di cua) or (dieu cua)) tu".
• Adding a wildcard symbol may retrieve word variants: te sach ly hang xa hoi. ((hieu va) OR (hieu qua)) cham hoc va hang ((di cua) or (dieu cua)) tu*.