Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
luc nhan » luc nhat, tue nhan, luc luan
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hang ve » hang va, hanh ve, hang ke
cu nhan » ca nhan
ca tren » cu tren, la tren, co tren
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu va cac ((luc nhan) or (cu nhan)) hang ve ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu va cac ((luc nhan) OR (cu nhan)) hang ve ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. hieu va cac ((luc nhan) or (cu nhan)) hang ve ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu va cac ((luc nhan) or (cu nhan)) hang ve ((cau tren) OR (ca tren))*.