Perhaps you should try some spelling variations:
thanh tung » thanh cong
dang trong » dung trong, dong trong, lang trong
hoc thieu » toc thieu, hoc hien
trong bai » trong ban, thong bai, trong hai
ho chieu » theo chieu, doi chieu, mot chieu
tung cao » nung cao, truong cao, trung cap
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (hoc thieu)) sach - thanh tung cao dang trong bai toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) sach - thanh tung cao dang trong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) sach - thanh tung cao dang trong bai toan cau*.