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 cong » luong cong, duong cong, cuong cong
hanh dung » thanh dung, anh dung, hanh dong
dung phan » dung nhan, dung luan, dung ha
cong tan » cong tac, cong san, cong thanh
tan pham » tuan pham, san pham, tac pham

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 cong tan pham thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat tach) OR (thuat sach)) - hanh dung phan xuong cong tan pham thi*.