Perhaps you should try some spelling variations:
hoc chieu » hoc thieu, ho chieu, hoc hien
cong dung » cuong dung, cong dong, cong luong
dat cong » dai cong, dam cong, bat cong
dung dat » dung va, dung tai
dat phan » data phan, dam phan, sat phan
van dan » van ban, ban dan, van dao
dan dat » dong dat, dinh dat, dan hoat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) OR (toc thieu)) sang - van dan dat cong dung dat phan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (toc thieu)) sang - van dan dat cong dung dat phan tu*".