Perhaps you should try some spelling variations:
thuoc cong » truoc cong, thuoc trong, thu cong
cong cong » cong dong, trong cong, dung cong
ty thuoc » ly thuoc, tu thuoc, ty thuc
bang va » hang va, ban va, trang va
ban vat » bang vat, ben vat, ban va
tam hoc » tam hon, am hoc, tam ho
ta hoc » tai hoc, te hoc, tu hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (tuyen or quyen) ((ta hoc) OR (tam hoc)) thuat đe co ((ban vat) or (bang va)) ty thuoc cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (tuyen OR quyen) ((ta hoc) OR (tam hoc)) thuat đe co ((ban vat) OR (bang va)) ty thuoc cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(tuyen or quyen) ((ta hoc) OR (tam hoc)) thuat đe co ((ban vat) or (bang va)) ty thuoc cong cong".
• Adding a wildcard symbol may retrieve word variants: (tuyen or quyen) ((ta hoc) OR (tam hoc)) thuat đe co ((ban vat) or (bang va)) ty thuoc cong cong*.