Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
thanh luc » thanh luu, than luc, nhan luc
lam chay » lam chat, lam thay, lam cha
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
thu sach » tu sach, thuat sach, thuoc sach
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
nang ma » sang ma, nang cao, mang may
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) v ((nang ma) OR (tang ma)) hoi. hieu va thanh luc van hanh lam chay tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) v ((nang ma) OR (tang ma)) hoi. hieu va thanh luc van hanh lam chay tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) v ((nang ma) OR (tang ma)) hoi. hieu va thanh luc van hanh lam chay tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) v ((nang ma) OR (tang ma)) hoi. hieu va thanh luc van hanh lam chay tren*.