Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
te sach » toc sach
cao hoc » co hoc, cho hoc, chat hoc
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
duc ban » duc van, dua ban, duc man
cua cau » cua cac, cua chu, cua cay
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 thu nang cao hoc. hieu ((van cac) OR (van bac)) ((duc ban) or (duc tan)) hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang cao hoc. hieu ((van cac) OR (van bac)) ((duc ban) OR (duc tan)) hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang cao hoc. hieu ((van cac) OR (van bac)) ((duc ban) or (duc tan)) hanh vi cua cau*".