Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
van hai » van ha, van chat, van hanh
va hanh » van hanh, va thanh, va danh
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 ty nang ma hoi. hieu ((van cau) or (van hai)) dat va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ma hoi. hieu ((van cau) OR (van hai)) dat va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. hieu ((van cau) or (van hai)) dat va hanh vi cua vat*.