Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
cau tren » dau tren, ca tren, cau treo
thanh vi » hanh vi, thanh va, thanh ve
cham luc » cham soc, nhan luc, cham cuu
sach ty » sach y, sach tu, sach thu
luc van » luoc van, luu van, duc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
ty dang » ty xang, ky dang, ty hang
cu tren » tu tren, dua tren

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 dang ((xay hoi) OR (tay hoi)). hieu ve cham luc van thanh vi ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty dang ((xay hoi) OR (tay hoi)). hieu ve cham luc van thanh vi ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty dang ((xay hoi) OR (tay hoi)). hieu ve cham luc van thanh vi ((cau tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty dang ((xay hoi) OR (tay hoi)). hieu ve cham luc van thanh vi ((cau tren) or (cu tren))*.