Perhaps you should try some spelling variations:
long khoa » luong khoa, lon khoa, dong khoa
khoa hoc » hoa hoc
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
sach ky » sach y, sach ty, sach kem
ve cam » ve cac, va cam, ve cai
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua te » cua tu

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) OR (sac ky)) long khoa hoc. hieu ((ve cam) or (ve cham)) luc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) long khoa hoc. hieu ((ve cam) OR (ve cham)) luc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) long khoa hoc. hieu ((ve cam) or (ve cham)) luc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) long khoa hoc. hieu ((ve cam) or (ve cham)) luc va hanh vi cua te*.