Perhaps you should try some spelling variations:
van lang » van nang, va lang, van hang
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
hieu tu » chieu tu, hieu tuc, hien tu
va hanh » van hanh, va thanh, va danh
tu cham » toc cham, thi cham
hoa hoi » khoa hoi, hoa hoc, hoa doi
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
ha hoi » ha noi, xa hoi, va hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu bach)) van lang ((ha hoi) OR (hoa hoi)). hieu tu cham luc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) van lang ((ha hoi) OR (hoa hoi)). hieu tu cham luc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) van lang ((ha hoi) OR (hoa hoi)). hieu tu cham luc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) van lang ((ha hoi) OR (hoa hoi)). hieu tu cham luc va hanh vi cua vat*.