Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
ty ngang » ly ngan, te ngan, ty hang
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
tu ngan » vu ngan, tu ngay, te ngan
cua cau » cua cac, cua chu, cua cay
ve cau » ke cau, va cau, ve cac
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: hoc sach ((((ty ngang) OR (ty xang))) or (tu ngan)) cho hoc. hieu ve cau luc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((((ty ngang) OR (ty xang))) OR (tu ngan)) cho hoc. hieu ve cau luc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((((ty ngang) OR (ty xang))) or (tu ngan)) cho hoc. hieu ve cau luc van hanh vi cua cau*".