Perhaps you should try some spelling variations:
loai hoc » logic hoc, loai khoa, dai hoc
hieu van » hieu va, thien van, lieu va
hanh via » hanh vi, hanh va, anh va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lai hoa » dai hoa
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((lai hoa) OR (loai hoc)). hieu van bac bo va hanh via cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((lai hoa) OR (loai hoc)). hieu van bac bo va hanh via cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((lai hoa) OR (loai hoc)). hieu van bac bo va hanh via cua tre*.