Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hac dat » tac dat, hoach dat, nhac dan
hoc dat » hoc dan, hoc dai, hoc phat
hang vi » hang va, hanh vi, hang di
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ma hoi. hieu van ((hac dat) OR (hoc dat)) ban hang vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. hieu van ((hac dat) OR (hoc dat)) ban hang vi cua vat*.