Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
2 nang » v nang
ma hoi » xa hoi, ma hoa, me hoi
sach 2 » sach y
xuc va » duc va, tuc va, luc va
di va » dai va, di vao, doi va
thiet » thieu

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 2 nang ((ma hoi) or (mai hoi)). ((hieu va) or (lieu va)) cam xuc va hanh di va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach 2 nang ((ma hoi) OR (mai hoi)). ((hieu va) OR (lieu va)) cam xuc va hanh di va thiet.
• Adding a wildcard symbol may retrieve word variants: hoc sach 2 nang ((ma hoi) or (mai hoi)). ((hieu va) or (lieu va)) cam xuc va hanh di va thiet*.