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
tinh luc » tinh duc, dinh luc, tinh khuc
thu sach » tu sach, thuat sach, thuoc sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
hieu va » lieu va, hieu qua
va tinh » may tinh
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 tinh 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 tinh 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 tinh luc van hanh lam chay tren*.