Perhaps you should try some spelling variations:
thuat dung » thuat hung, thuat ung, thuat xung
dung cong » dung trong
quyen va » quyen van, quyen vo, quyen xa
luyen va » xuyen va, luyen tap, huyen van
trac chu » tran chau, truc chua, cac chu
ban lay » ban tay
ban ly » bang ly, ban le, ban ky

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

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