Perhaps you should try some spelling variations:
va trinh » van trinh, va tinh, lap trinh
trinh vu » trinh va, trinh ve, trinh vi
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky
va nam » van nam, ha nam
va nay » va ngay, va cay
vu cua » hu cua, tu cua

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

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