Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hieu vu » hieu va, hieu ve, hieu su
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang ((cao hoi) or (cao hoc)). hieu vu ((cham luc) or (cham cuu)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((cao hoi) OR (cao hoc)). hieu vu ((cham luc) OR (cham cuu)) van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((cao hoi) or (cao hoc)). hieu vu ((cham luc) or (cham cuu)) van hanh vi cuu tre*.