Perhaps you should try some spelling variations:
quyen tap » tuyen tap, quyen cap, huyen tam
luyen tap » tuyen tap, luyen thi
dung cong » dung trong
thi dung » thi huong, thi nhung, thi cong
cac thu » cach thuc, cac thoi
ban vat » bang vat, ben vat, ban dat
van vat » van chat, nhan vat
y thi » ky thi, y thai, ly thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((quyen tap) OR (luyen tap)) cac thu đe co ((((ban vat) or (van vat))) or (ban va)) y thi dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen tap) OR (luyen tap)) cac thu đe co ((((ban vat) OR (van vat))) OR (ban va)) y thi dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tap) OR (luyen tap)) cac thu đe co ((((ban vat) or (van vat))) or (ban va)) y thi dung cong".
• Adding a wildcard symbol may retrieve word variants: ((quyen tap) OR (luyen tap)) cac thu đe co ((((ban vat) or (van vat))) or (ban va)) y thi dung cong*.