Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dan hang » ban hang, van hang, dat hang
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua dan » cua dang, cua ban, ca dan
hang vi » hang va, hanh vi, hang di
ve nam » he nam, va nam, le nam
vi cau » va cau, ve cau, di cau

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 xa hoi. hieu ve nam cua dan hang vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ve nam cua dan hang vi cau tren*.