Perhaps you should try some spelling variations:
thuat tach » thuat mach, thuat tac, thuat thanh
thuat sach » thuat lanh, thuat san
phan xuong » phan cong
xuong dong » xuong song, tuong dong, xuong cong
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 phan » thanh phan, toan ban, hoa phan
phan tai » pham tai, nhan tai, phan thi

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 tach) or (thuat sach)) - hanh dung phan xuong dong toan phan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat tach) OR (thuat sach)) - hanh dung phan xuong dong toan phan tai*.