Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
van cham » van chat, van tham, van pham
thanh da » thanh dat, thanh dam, thanh dan
dau tren » dau tien, dat tren, dau tieng
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
va cham » va chat, va tham
soc gia » toc gia, hoc gia, so gia
y nang » ky nang, ly nang, v nang
da dau » dan dau, dat dau, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang mai hoi. hieu ((van cham) or (va cham)) soc gia thanh da dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang mai hoi. hieu ((van cham) OR (va cham)) soc gia thanh da dau tren.
• Adding a wildcard symbol may retrieve word variants: so sach y nang mai hoi. hieu ((van cham) or (va cham)) soc gia thanh da dau tren*.