Perhaps you should try some spelling variations:
phan xuong » phan cong
thuat sach » thuat lanh, thuat san
xuong dong » xuong song, tuong dong, xuong cong
thuat tac » thuat tach, thuat tao, thuat tai
hanh dung » thanh dung, anh dung, hanh dong
dung phan » dung nhan, dung luan, dung ha
dong toan » dung toan, bong toan, cong toan
toan pham » toan phan, tuan pham, toan ham
pham tai » pham thi, pham van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuat tac) or (thuat sach)) - hanh dung phan xuong dong toan pham tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat tac) OR (thuat sach)) - hanh dung phan xuong dong toan pham tai.
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat tac) or (thuat sach)) - hanh dung phan xuong dong toan pham tai*.