Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cau duc » cao duc, cau luc, chu duc
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
ma hoi » mai hoi, xa hoi, me hoi
ve cau » ke cau, va cau, ve cac
vi cu » vi su, vi xu, vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nang ((ma hoi) or (ma hoa)). hieu ve cau duc va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ((ma hoi) OR (ma hoa)). hieu ve cau duc va hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ((ma hoi) or (ma hoa)). hieu ve cau duc va hanh vi cu tren*.