Perhaps you should try some spelling variations:
vuc nang » cuc nang, chuc nang, van nang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
hau luc » hau loc, cau luc, nhan luc
hanh de » hanh ve, hanh kem
hanh le » thanh le, hanh ve, manh le
luc van » luoc van, luu van, duc van
van hau » van ha, van hai, van dau
vu nang » va nang, vu dang, v nang
cua tre » cua te, cuu tre, cua triet

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

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