Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
truc van » truc va, thuc van, truc ban
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 ky » sac ky, sach y, sach ty
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
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 ky) or (sach tu)) nang x hoi. hieu va cau truc van hanh lam chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach tu)) nang x hoi. hieu va cau truc van hanh lam chay tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach tu)) nang x hoi. hieu va cau truc van hanh lam chay tren*.