Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
hanh de » hanh ve, hanh kem
luc van » luoc van, luu van, duc van
hau luc » hau loc, cau luc, nhan luc
van hau » van ha, van hai, van dau
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) OR (v nang)) xa hoi. hieu van hau luc van hanh de ((cuu tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) xa hoi. hieu van hau luc van hanh de ((cuu tre) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (v nang)) xa hoi. hieu van hau luc van hanh de ((cuu tre) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (v nang)) xa hoi. hieu van hau luc van hanh de ((cuu tre) or (ca tren))*.