Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
thuat sach » thuat lanh, thuat san
thuat tac » thuat tach, thuat tao, thuat tai
phan cong » thanh cong
dong toan » dung toan, bong toan, cong toan
toan pha » toan phan, toan phai, toan nha
pha tap » pham tai

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 trung ((phan xuong) OR (phan cong)) dong toan pha tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat tac) OR (thuat sach)) - hanh trung ((phan xuong) OR (phan cong)) dong toan pha tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuat tac) or (thuat sach)) - hanh trung ((phan xuong) OR (phan cong)) dong toan pha tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat tac) or (thuat sach)) - hanh trung ((phan xuong) OR (phan cong)) dong toan pha tap*.