Perhaps you should try some spelling variations:
ngang cho » nang cho, ngang tho, sang cho
toc sach » hoc sach, doc sach, thuoc sach
ty ngang » ly ngan, te ngan, tu ngan
hanh vai » hanh vi, hanh va, hanh tai
luu van » cuu van, luan van, luu hanh
cua cau » cua cac, cua cay, cua can
duc van » duc va, duc tan, duc manh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
cua chu » sua chua
va cau » van cau, va cac, va dau

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 ngang cho hoc. hieu va cau ((duc van) or (luu van)) hanh vai ((cua cau) OR (cua chu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ngang cho hoc. hieu va cau ((duc van) OR (luu van)) hanh vai ((cua cau) OR (cua chu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ngang cho hoc. hieu va cau ((duc van) or (luu van)) hanh vai ((cua cau) OR (cua chu))*".