Perhaps you should try some spelling variations:
hanh van » thanh van, khanh van, hanh va
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
dau tren » dau tien, dat tren, dau tieng
doc hoc » duoc hoc, duc hoc, hoc hoc
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, vuc van
van dau » van dao, phan dau
toc hoc » toan hoc, duoc hoc
sac ky » cac ky, sai ky

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 ky) or (sac ky)) nang ((doc hoc) or (toc hoc)). hieu ve cham xuc van hanh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang ((doc hoc) OR (toc hoc)). hieu ve cham xuc van hanh van dau tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang ((doc hoc) or (toc hoc)). hieu ve cham xuc van hanh van dau tren*.