Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham hoc » cham soc, chat hoc, cham hoi
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
te sach » toc sach
vu sach » vu bach, su sach, vu khach
lang xa » dang xay, lang van
lang ha » long ha
vi cua » vai cua, di 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) or (vu sach)) y ((lang xa) OR (lang ha)) hoi. hieu van cham hoc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) y ((lang xa) OR (lang ha)) hoi. hieu van cham hoc va hanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) y ((lang xa) OR (lang ha)) hoi. hieu van cham hoc va hanh vi cua viet*".