Perhaps you should try some spelling variations:
sach kem » hanh kem
cau tren » cu tren, dau tren, ca tren
luc hoc » duoc hoc
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, ve chim
sai ky » sac ky
xuc va » duc va, tuc va, luc va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach kem) or (sai ky)) nang luc hoc. hieu ((ve cham) or (vu cham)) xuc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach kem) OR (sai ky)) nang luc hoc. hieu ((ve cham) OR (vu cham)) xuc va hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach kem) or (sai ky)) nang luc hoc. hieu ((ve cham) or (vu cham)) xuc va hanh vi cau tren*.