Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hanh di » hanh vi, hanh de, hang di
hieu vu » hieu va, hieu ve, dieu vu
luc van » luoc van, luu van, duc van
hieu su » hieu sau, tieu su, hieu so
di cua » dai cua, doi cua, de cua
te sai » te tai, te bai, te lai
sai ky » sac ky

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) OR (hieu su)) cham luc van hanh di 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) OR (hieu su)) cham luc van hanh di 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) OR (hieu su)) cham luc van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) or (nang x)) hoi. ((hieu vu) OR (hieu su)) cham luc van hanh di cua tre*.