Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh lam » thanh lap, hanh kem, hanh va
lam chay » lam chat, lam thay, lam cha
sach tu » sach thu, cach tu, sach ty
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
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: tu ((sach y) or (sach tu)) nang x hoi. hieu van cau luc van hanh lam chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach tu)) nang x hoi. hieu van cau luc van hanh lam chay tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach tu)) nang x hoi. hieu van cau luc van hanh lam chay tren*.