Perhaps you should try some spelling variations:
phan tuong » phan thuong, phan truong, phan xuong
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, ho chieu, mot chieu
hanh tang » hanh trang, anh tang, hanh mang
tuong dan » huong dan, tung dan, xuong dan
tang cua » mang cua, hang cua, tang luan
cua phan » cua nhan, cua phap, cua han
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tang cua phan tuong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (((doi chieu) OR (doi chi)))) tinh - hanh tang cua phan tuong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tang cua phan tuong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tang cua phan tuong dan toan cao*.