Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
cay mang » cach mang, cay mac, cay cong
van hanh » van thanh, ban hanh, van anh
dat tren » dat trong, dua tren
may hoi » may thoi, tay hoi, mai hoi
qua cau » quan cau, qua cac, qua ca
cau duc » cao duc, cau luc, chu duc
duc van » duc va, duc tan, duc manh
vi dat » voi dat, vi dai, va dat

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) or (thuat sach)) cay mang may hoi. hieu qua cau duc van hanh vi dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat sach)) cay mang may hoi. hieu qua cau duc van hanh vi dat tren.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat sach)) cay mang may hoi. hieu qua cau duc van hanh vi dat tren*.