Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
sang mai » sang ma, sang tai, lang mai
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
sach ty » sach y, sach tu, xach tay
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) sang mai hoi. hieu va cam duc ban hanh vi ((cua te) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) sang mai hoi. hieu va cam duc ban hanh vi ((cua te) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) sang mai hoi. hieu va cam duc ban hanh vi ((cua te) or (cau tren))*.