Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
chao chu » cho chu, cua chu, cao cho
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
phan cac » nhan cach, phan dau, phan lap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (chao chu)) xanh - canh tranh ((cua dung) OR (qua dung)) cong vang phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (chao chu)) xanh - canh tranh ((cua dung) OR (qua dung)) cong vang phan cac~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (chao chu)) xanh - canh tranh ((cua dung) OR (qua dung)) cong vang phan cac*.