Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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) or (su sach)) ky nang ma hoi. ((hieu va) or (hieu van)) cam xuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ma hoi. ((hieu va) OR (hieu van)) cam xuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ma hoi. ((hieu va) or (hieu van)) cam xuc va hanh vi cua vat*.