Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
lam chay » lam chat, lam thay, lam cha
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
cau luoc » cau luc, muu luoc, hau loc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty hang, ly nang
su sach » so sach, vu sach
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) or (su sach)) ((ty nang) or (ty xang)) x hoi. hieu va cau luoc van hanh lam chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((ty nang) OR (ty xang)) x hoi. hieu va cau luoc van hanh lam chay tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ((ty nang) or (ty xang)) x hoi. hieu va cau luoc van hanh lam chay tren*.