Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
hieu van » hieu va, thien van, lieu va
tu nano » truc nano
cho hoc » co hoc, khoa hoc
cac xuc » cam xuc, cac nuoc, cac cuoc
tu nang » tru nang, tu nong, tu lang
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: doc sach ((tu nang) OR (tu nano)) cho hoc. hieu van ((cac xuc) or (chat xuc)) van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((tu nang) OR (tu nano)) cho hoc. hieu van ((cac xuc) OR (chat xuc)) van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((tu nang) OR (tu nano)) cho hoc. hieu van ((cac xuc) or (chat xuc)) van hanh vi cua cau*".