Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
cham luc » cham soc, cham cuu, chat lua
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, hieu su
nang xa » lang xa, nang ma, mang xa
sai ky » sac ky
vi cua » vai cua, di cua
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((nang xa) or (nang x)) hoi. hieu vu ((cham luc) OR (nhan luc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang xa) OR (nang x)) hoi. hieu vu ((cham luc) OR (nhan luc)) van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((nang xa) or (nang x)) hoi. hieu vu ((cham luc) OR (nhan luc)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (nang x)) hoi. hieu vu ((cham luc) OR (nhan luc)) van hanh vi cua tre*.