Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hang hoa » hang khoa, thanh hoa, hang va
cac xuc » cam xuc, chat xuc, cac cuoc
te sach » toc sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky hang » ky nang, ly hang, ky dang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
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: ((te sach) or (su sach)) ky hang hoa hoi. hieu va ((cac xuc) OR (cac nuoc)) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky hang hoa hoi. hieu va ((cac xuc) OR (cac nuoc)) van hanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky hang hoa hoi. hieu va ((cac xuc) OR (cac nuoc)) van hanh vi cua viet*".