Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hac » van hoc, van ha, van hai
hac dat » hoc dat, tac dat, hoach dat
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
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 ((y nang) OR (v nang)) ma hoi. hieu van hac dat va hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) OR (v nang)) ma hoi. hieu van hac dat va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) OR (v nang)) ma hoi. hieu van hac dat va hanh vi cua vat*.