Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
doi cua » dai cua, hoi cua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
va nang » van nang, da nang, cam nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
di cua » dai cua, de cua, do cua
v nang » vu nang, van nang, voi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((v nang) or (va nang)) ma hoi. hieu ve cac luc van hanh ((di cua) or (doi cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (va nang)) ma hoi. hieu ve cac luc van hanh ((di cua) OR (doi cua)) tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (va nang)) ma hoi. hieu ve cac luc van hanh ((di cua) or (doi cua)) tu*.