Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
hieu cao » chieu cao, hieu cac, hieu ca
chat luc » chat xuc, chat lua, nhan luc
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 kem
sach ty » sach y, sach tu, sach thu
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 ky) or (sach ty)) nang x hoi. hieu cao chat luc van hanh lam chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu cao chat luc van hanh lam chay tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x hoi. hieu cao chat luc van hanh lam chay tren*.