Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van nang » van quang, van ban, van dong
hanh doi » thanh doi, hanh noi, hang doi
vuc nang » cuc nang, vu nang, chuc nang
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
doi cua » dai cua, hoi cua
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((van nang) or (vuc nang)) xa hoi. ((hieu ve) or (hieu van)) cam duc van hanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((van nang) OR (vuc nang)) xa hoi. ((hieu ve) OR (hieu van)) cam duc van hanh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ((van nang) or (vuc nang)) xa hoi. ((hieu ve) or (hieu van)) cam duc van hanh doi cua tu*.