Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, thuoc sach, nuoc sach
thanh vi » hanh vi, thanh va, thanh ve
doc sach » hoc sach, nuoc sach, dac sac
nang cho » nang chon, ngang cho, nang cao
cac xuc » cac nuoc, chat xuc, cac cuoc
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
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: ((toc sach) OR (doc sach)) ty nang cho hoc. hieu va ((cac xuc) or (cam xuc)) van thanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang cho hoc. hieu va ((cac xuc) OR (cam xuc)) van thanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty nang cho hoc. hieu va ((cac xuc) or (cam xuc)) van thanh vi cua cau*".