Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh vai » thanh hai, thanh van, thanh tai
luoc van » luoc can, luoc va, luc van
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
luu van » cuu van, luan van, luu hanh
ve cam » ve cham, ve cac, va cam
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky mang may hoi. hieu ve cam ((luu van) or (luoc van)) thanh vai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky mang may hoi. hieu ve cam ((luu van) OR (luoc van)) thanh vai va trien.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky mang may hoi. hieu ve cam ((luu van) or (luoc van)) thanh vai va trien*.