Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
chat soc » cham soc, chat hoc, chat doc
sach tay » sach hay, sach nay, sach tai
van chat » cao chat
xach tay » canh tay
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va danh, ban hanh
ve cau » ke cau, va cau, ve cac

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 tay) OR (xach tay)) lang xa hoi. hieu van chat soc ((va hanh) or (va thanh)) ve cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tay) OR (xach tay)) lang xa hoi. hieu van chat soc ((va hanh) OR (va thanh)) ve cau theo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tay) OR (xach tay)) lang xa hoi. hieu van chat soc ((va hanh) or (va thanh)) ve cau theo*".