Perhaps you should try some spelling variations:
ngang cho » nang cho, ngang tho, sang cho
sach thu » sach thue, sach thieu, sach tham
hanh va » hang va, hanh vi
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay
va cau » van cau, va cac, va dau
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) OR (sach thu)) ngang cho hoc. hieu va cau ((luc van) or (luu van)) hanh va cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) ngang cho hoc. hieu va cau ((luc van) OR (luu van)) hanh va cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) ngang cho hoc. hieu va cau ((luc van) or (luu van)) hanh va cua cau*".